Pot

As part of His creation and re-creation process Lord Vishnu, at the end of the Tretha yugam asked Brahma to make a pot and put the quintessential and the eternal Vedas and sastras into it and carry them forward to the next yuga.    

1. kudavasal indicates mouth of the pot, 
2. kumbakonam the angle and 
3. thirucherai the content  

http://en.wikipedia.org/wiki/Kudavasal
https://www.youtube.com/results?search_query=Kudavasal 

http://mbakon.blogspot.com/

http://8div.blogspot.com/2015/05/pancha-sara-kshetram.html  

Pancha sara kshetram

This is a pancha sara kshetram: 

1. Kshetram – Sarakshetram; 
2. Temple tank – Sarapushkarni; 
3. Vimanam –Saravimanam; 
4. Lord – Saranatha; 
5. Goddess – Five Goddess.

Wiki 

http://en.wikipedia.org/wiki/Tirucherai_Saranathan_Temple 

Five Goddess  - 

1. Sridevi, 
2. Bhoodevi, 
3. Neeladevi, 
4. Mahalakshmi and 
5. Saranayaki.   

Tube 

https://www.youtube.com/results?search_query=Tirucherai+Saranathan  
  

The Lord here was worshiped 

1. by Brahma in Kritha yuga, 
2. by Saints in Tretha yuga, 
3. by Garuda in Dwapara yuga and 
4. by Mother Cauvery in Kaliyuga. 

https://freeglobaluniversity.blogspot.com/search/label/YUGA

Three Posture in Single Temple

Lord is seen in all three postures at this Divya Desam.

1. At the base Tier is Koodal Azhagar in a grand sitting posture under the Serpent Lord Aadhiseshan. 
2. Climbing about 20 steps on to Tier 1, one sees the Lord in a Sleeping Posture. 
3. And another 10 steps above, in Tier 2, is Lord Surya Narayanan in a standing posture.

http://en.wikipedia.org/wiki/Koodal_Azhagar_Temple
https://www.youtube.com/results?search_query=Koodal+Azhagar 

Overall
http://8div.blogspot.com/2010/11/appearance-of-revered-deities.html 

Pancha Samskara

The temple is the place where god Vishnu initiated Pancha Samskara (religious initiation) to Thirumangai Azhwar.
https://www.google.com/search?q=Pancha+Samskaram

Nachiyar temple Thirunaraiyur / Map
http://en.wikipedia.org/wiki/Nachiyar_Koil
http://wikimapia.org/5420623/Sri-Nachiyar-Temple

Also
1. Another specialty of the temple is only in this divyadesam, there is brahma in standing posture inside the temple.
2. It is the only temple among the 108 divyadesams of srivaishnavas where God Naraiyur nambi has the conch and charka in front of his face.

Vallalar

Sri Ramalinga Swamigal (Vallalar) has composed five verses in Tamil in praise of Lord Sri Veeraraghavan, after having been relieved of acute stomach ache due to His grace.

https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=1280&bih=600&q=Vaidya+Veeraraghava+Swamy+Temple

https://www.youtube.com/results?search_query=Vaidya+Veeraraghava+Swamy+Temple 

South

http://southernindiainformation.blogspot.com/2014/12/divya-desams.html

Tri / Pancha Rangam

http://raninformation.blogspot.com/