GNRO-2005/00053, Technical Specification Bases Update to the NRC for Period Dated August 23, 2005

Technical Specification Bases Update to the NRC for Period Dated August 23, 2005

ML052360055
Person / Time
Site:	Grand Gulf
Issue date:	08/23/2005
From:	Bottemiller C Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GNRO-2005/00053
Download: ML052360055 (5)

Text

GNRO-2005100053 August 23,2005 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Document Control Desk

Subject:

Technical Specification Bases Update to the NRC for Period Dated August 23,2005 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-2005100046 letter dated August 1, 2005 to the NRC from GGNS). This update is consistent with update frequency listed in 10CFR50.71(e).

Should you have any questions, please contact Michael Larson at (601) 437-6685.

Yours truly, CAB1MJ L attachment: GGNS Technical Specification Bases Revised Pages cc: (See Next Page)

GNRO-2005/00053 PAGE 2 Compton J. N. (w/o)

Levanway D. E. (Wise Carter) (w/a)

Reynolds N. S. (wh)

Smith L. J. (Wise Carter) (wla)

NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150 US. Nuclear Regulatory Commission ALL LETTERS ATTN: Dr. Bruce S. Mallett (w/2) 61 1 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 U S . Nuclear Regulatory Commission ALL LETTERS - COURIER ATTN: Mr. , NRR/DLPM (w/2) DELIVERY (FEDEX, ETC.)

ATTM: ADDRESSEE ONLY ATTM: Courier Delivery Only Mail Stop OWFN/7D-I 11555 Rockville Pike Rockville, M D 20852-2378

ATTACHMENT to GNRO-2005/00053 Grand Gulf Technical Specification Bases Revised Pages dated August 23,2005

Primary Containment Air Locks B 3.6.1.2 3 3.6 C O N T A I N M E N T SYSTEMS B 3.6.1.2 Primary Containment Air Locks BASES B A C KG RO U N D Two double door primary containment a i r l o c k s have been b u i l t i n t o t h e primary containment t o provide personnel a c c e s s t o t h e primary containment a n d t o provide primary containment i s o l a t i o n during t h e process of personnel e n t r y a n d e x i t . The a i r l o c k s a r e designed t o withstand t h e same l o a d s , t e m p e r a t u r e s , a n d peak design i n t e r n a l a n d e x t e r n a l p r e s s u r e s a s t h e primary containment ( R e f . 1 ) . As p a r t of t h e primary containment, t h e a i r lock l i m i t s t h e r e l e a s e of r a d i o a c t i v e m a t e r i a l t o t h e environment d u r i n g normal u n i t o p e r a t i o n a n d through a range of t r a n s i e n t s a n d a c c i d e n t s u p t o a n d i n c l u d i n g p o s t u l a t e d Design Basis Accidents (DBAs).

Each a i r lock d o o r has been designed a n d t e s t e d t o c e r t i f y i t s a b i l i t y t o withstand p r e s s u r e i n excess of t h e maximum expected p r e s s u r e following a D B A i n primary containment.

Each of t h e doors has i n f l a t a b l e s e a l s t h a t a r e maintained a t a 70 p s i g nominal p r e s s u r e by t h e s e a l a i r f l a s k a n d pneumatic system, which i s maintained a t a p r e s s u r e 2 90 p s i g . Each door has t w o s e a l s t o ensure they a r e s i n g l e f a i l u r e proof i n maintaining t h e l e a k t i g h t boundary of primary containment ~

Each a i r lock i s nominally a r i g h t c i r c u l a r c y l i n d e r , 1 0 f t 2 inches i n d i a m e t e r , with doors a t each end t h a t a r e i n t e r l o c k e d t o prevent simultaneous opening. The a i r locks a r e provided with t e s t connection v a l v e s . The a i r lock a i r provided with l i m i t switches on b o t h doors i n each a i r lock t h a t provide c o n t r o l room i n d i c a t i o n of door p o s i t i o n .

During periods when primary containment i s n o t required t o be OPERABLE, t h e a i r lock i n t e r l o c k mechanism may be d i s a b l e d , allowing b o t h doors of a n a i r lock t o remain open f o r extended p e r i o d s when f r e q u e n t primary containment e n t r y i s necessary. Under some c o n d i t i o n s , as allowed by t h i s L C O , t h e primary containment may be accessed through t h e a i r lock when t h e door i n t e r l o c k mechanism has f a i l e d , by manually performing t h e i n t e r l o c k f u n c t i o n .

The primary containment a i r locks form p a r t of t h e primary containment p r e s s u r e boundary. As such, a i r lock i n t e g r i t y a n d leak t i g h t n e s s a r e e s s e n t i a l f o r maintaining primary containment leakage r a t e t o withir: l i m i t s i n t h e event of a G R A N D GULF B 3.6-5 L D C 04076

Primary Containment Air Locks S 3.6.1.2 BASES ACTIONS D . l a n d 0.2 (continued) does n o t a p p l y . To achieve t h i s s t a t u s , t h e p l a n t must be brought t o a t l e a s t MODE 3 w i t h i n 1 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> a n d t o MODE 4 w i t h i n 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The allowed Completion Times a r e r e a s o n a b l e , based on o p e r a t i n g e x p e r i e n c e , t o reach t h e r e q u i r e d p l a n t c o n d i t i o n s from f u l l power c o n d i t i o n s i n a n order1 y manner a n d without c h a l l engi n g p l a n t systems.

SURVEILLANCE SR 3.6.1.2.1 REQUIREMENTS Maintaining primary containment a i r l o c k s O P E R A B L E r e q u i r e s compliance with t h e leakage r a t e t e s t requirements of 10 C F R 5 0 , Appendix J ( R e f . 2), a s modified by approved exemptions. This SR r e f l e c t s t h e leakage r a t e t e s t i n g requirements with regard t o a i r lock leakage (Type B leakage t e s t s ) . The leakage r a t e t e s t i n g requirements i n c l u d e t h e a i r l o c k t e s t connection v a l v e s (Type C leakage t e s t s ) . The I p e r i o d i c t e s t i n g requirements v e r i f y t h a t t h e a i r lock leaKage does n o t exceed t h e allowed f r a c t i o n o f t h e o v e r a l l primary containment leakage r a t e .

The SR has been modified by two Notes, Note i s t a t e s t h a t a n i n o p e r a b l e a i r lock door does n o t i n v a l i d a t e t h e previous s u c c e s s f u l performance o f t h e o v e r a l l a i r lock leakage t e s t .

This i s considered reasonable s i n c e e i t h e r a i r lock d o o r i s capable o f providing a f i s s i o n product b a r r i e r in t h e event o f a DBA. Note 2 has been added t o t h i s SR, r e q u i r i n g t h e r e s u l t s t o be e v a l u a t e d a g a i n s t t h e acceptance c r i t e r i a o f SR 3 . 6 . 1 . 1 . 1 . This ensures t h a t a i r lock leakage i s p r o p e r l y accounted f o r i n determining t h e o v e r a l l primary containment leak.age r a t e . Since t h e o v e r a l l primary containment leakage r a t e i s only a p p l i c a b l e i n MODES 1 , 2 ,

a n d 3 o p e r a t i o n , t h e Note 2 requirement i s imposed only during t h e s e MODES.

SR 3.6.1.2.2 The s e a l a i r f l a s k p r e s s u r e i s v e r i f i e d t o be a t 2 90 p s i g every 7 d a y s t o ensure t h a t the seal system remains v i a b l e I t must be checked because i t could bleed down during o r GRAND GULF S 3.6-11 LDC c5044