GNRO-2007/00043, Technical Specification Bases Update to the NRC for Period Dated June 13, 2007

Technical Specification Bases Update to the NRC for Period Dated June 13, 2007

ML071650102
Person / Time
Site:	Grand Gulf
Issue date:	06/13/2007
From:	Bottemiller C Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GNRO-2007/00043
Download: ML071650102 (4)

Text

Entergy Operations, Inc.

PO. Box 756 Port Gibson, MS 39150 Tel601 437 2800 GNRO-2007/00043 June 13,2007 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Document Control Desk

Subject:

Technical Specification Bases Update to the NRC for Period Dated June 13,2007 Grand Gulf Nuclear Station Docket No. 50-416 License No. NPF-29

Dear Sir and Madam:

Pursuant to Grand Gulf Nuclear Station (GGNS) Technical Specification 5.5.1 1, Entergy Operations, Inc. hereby submits an update of all changes made to GGNS Technical Specification Bases since the last submittal (GNRO-2007/00021 dated April 11, 2007 to the NRC from GGNS). This update is consistent with update frequency listed in IOCFR50.71(e).

This letter does not contain any commitments.

Should you have any questions, please contact W. B. Abraham at (601) 437-2319.

Sincerely, Charles A. Bottemiller Manager, Plant Licensing CABNVBA attachment: GGNS Technical Specification Bases cc: (See Next Page)

GNRO-2007/00043 Page 2 cc:

NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150 U.S. Nuclear Reaulatorv Commission ALL LETTERS ATTN: Dr. Bruce S. Mallett (w/2) 61 1 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 U.S. Nuclear Requlatorv Commission ALL LETTERS -

ATTN: Mr. Bhalchandra Vaidya, NRWDORL (w/2) I COURIER DELIVERY (FEDEX, ETC.)

AlTN: ADDRESSEE ONLY ADDRESS ONLY -

ATTN: Courier Delivery Only ****DO NOT USE FOR Mail Stop OWFN/O-7DlA US. POSTAL 11555 Rockville Pike SERVICE Rockville, MD 20852-2378 ADDRESS*****

NOT USED IF EIE USED

ATTACHMENT to GNRO-2007/00043 Grand Gulf Technical Specification Bases Revised Pages dated June 13,2007 LDC# BASES PAGES AFFECTED TOPIC of CHANGE 07022 B 3.6-87 This change reflects the volume of in-leakage associated with degradation of the secondary containment between performances of surveillance requirement 3.6.4.1.3. The assumed in-leakage from building degradation was decreased from 125 SCFM to 115 SCFM as documented in revision 5 to calculation M3.9.012 via EC-0000696.

Secondary Containment B 3.6.4.1 BASES SURVEILLANCE SR 3 . 6 . 4 . 1 . 3 and S R 3.6-4.1. 4 R E Q U I REMENTS (continued) The SGT System e x h a u s t s t h e secondary c o n t a i n m e n t atmosphere t o t h e environment t h r o u g h a p p r o p r i a t e t r e a t m e n t equipment.

To e n s u r e t h a t a l l f i s s i o n p r o d u c t s a r e t r e a t e d , SR 3 . 6 . 4 . 1 . 3 v e r i f i e s t h a t t h e SGT System w i l l r a p i d l y e s t a b l i s h and m a i n t a i n a p r e s s u r e i n t h e s e c o n d a r y containment t h a t i s l e s s than t h e l o w e s t p o s t u l a t e d pressure e x t e r n a l t o t h e secondary c o n t a i n m e n t b o u n d a r y .

SR 3.6.4.1.4 d e m o n s t r a t e s t h a t each OPERABLE SGT subsystem can m a i n t a i n a r e d u c e d p r e s s u r e i n t h e s e c o n d a r y c o n t a i n m e n t s u f f i c i e n t t o a l l o w t h e secondary c o n t a i n m e n t t o be i n t h e r m a l e q u i l i b r i u m a t s t e a d y s t a t e c o n d i t i o n s . The t e s t c r i t e r i o n s p e c i f i e d by S R 3.6.4.1.4 i n c l u d e s an a l l o w a n c e f o r b u i l d i n g d e g r a d a t i o n between p e r f o r m a n c e s o f t h e surveillance. This allowance represents a d d i t i o n a l b u i l d i n g i n - l e a k a g e o f 115 scfm. I As d i s c u s s e d i n 6 3 . 6 . 4 . 2 , t h e SGT System has t h e c a p a c i t y t o m a i n t a i n secondary c o n t a i n m e n t n e g a t i v e p r e s s u r e assuming t h e f a i l u r e o f a l l non q u a l i f i e d l i n e s 2 i n c h e s and s m a l l e r p l u s o t h e r a n a l y z e d f a i l u r e s . The number and s i z e o f t h e s e assumed f a i l u r e s can v a r y as p e n e t r a t i o n s a r e added o r removed f r o m t h e secondary c o n t a i n m e n t b o u n d a r y . To a c c o u n t f o r t h e absence o f t h e s e assumed f a i l u r e s u n d e r t e s t c o n d i t i o n s t h e t e s t c r i t e r i a s p e c i f i e d by SRs 3 . 6 . 4 . 1 . 3 and 3.6..4.1.4 a r e m o d i f i e d . These f a i l u r e s c o u l d i n c r e a s e secondary c o n t a i n m e n t i n - l e a k a g e by a p p r o x i m a t e l y 300 scfm.

To a c c o u n t f o r t h i s a d d i t i o n a l i n - l e a k a g e , t h e r e q u i r e d vacuum l e v e l o f SR 3 . 6 . 4 . 1 . 3 i s m o d i f i e d t o r e q u i r e t h a t t h e secondary c o n t a i n m e n t can be drawn down t o 2 0.311 i n c h e s o f vacuum w a t e r gauge i n 180 seconds. F o r t h e same r e a s o n , t h e r e q u i r e d vacuum l e v e l o f SR 3 . 6 . 4 . 1 . 4 i s a l s o m o d i f i e d t o r e q u i r e secondary c o n t a i n m e n t b e m a i n t a i n e d 2 0.311 i n c h e s o f vacuum w a t e r gauge f o r 1 h o u r u s i n g one SGT subsystem a t a f l o w r a t e I 4 0 0 0 cfm. The vacuum l e v e l used f o r t h e s e s u r v e i l l a n c e s r e p r e s e n t s t h e minimum r e q u i r e d t o e n s u r e t h a t t h e i n t e g r i t y o f t h e SGT system b o u n d a r y w i l l meet i t s d e s i g n r e q u i r e m e n t o f r e a c h i n g ( w i t h i n 180 seconds) and m a i n t a i n i n g 2 0 . 2 5 i n c h e s o f vacuum w a t e r gauge f o l l o w i n g a p o s t u l a t e d a c c i d e n t when combined w i t h t h e assumed f a i l u r e s .

The p r i m a r y p u r p o s e o f t h e s e SRs i s t o e n s u r e secondary c o n t a i n m e n t boundary i n t e g r i t y . The secondary p u r p o s e o f (continued)

GRAND GULF B 3.6-87 LDC 07022