For Surry,

 

For initial criticality rods are full out and we go critical by dilution. 

 

For mid-cycle, RCS boron is adjusted to the ECC value before pulling control banks. 

 

Adina LaFrance, PE

Lead Reactor Engineer

Surry Power Station

 

Dominion Generation

Phone: 757-365-2658; Internal: 8-798-2658

E-mail: Adina.K.LaFrance@dom.com

 

From: PWRRM [mailto:pwrrm-bounces@retaqs.com] On Behalf Of Wellbaum, Daniel A
Sent: Wednesday, November 16, 2016 3:57 PM
To: Kenneth Pike; pwrrm@retaqs.com
Subject: [External] Re: [Pwrrm] final approach to critical, boron dilute or pull rods?

 

At Catawba for BOC startup we attempt to go critical by control bank withdrawal with control bank D approximately 120 pcm inserted, to be close to desired condition for physics testing.  If we do not achieve criticality on rod withdrawal we dilute.

 

For mid-cycle startups we adjust RCS boron before control bank withdrawal and then withdraw control banks to go critical.  We do not have contingency to dilute to critical.

 

Dan Wellbaum

Reactor Engineering

Catawba Nuclear Station

 

From: PWRRM [mailto:pwrrm-bounces@retaqs.com] On Behalf Of Kenneth Pike
Sent: Wednesday, November 16, 2016 3:08 PM
To: pwrrm@retaqs.com
Subject: [Pwrrm] final approach to critical, boron dilute or pull rods?

 



Do you still position rods and dilute to critical during initial startup after a refueling?

On a mid cycle startup do you dilute to critical boron then pull rods to critical or position control rod at estimated critical position and dilute to critical?

TVA is interested in what method other plants are using to achieve criticality.

 

 

Thanks

 

Ken Pike

(610) 277-8991 x 253

 

 


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