ML071410463

Proposed License Amendment Request Addition of LCO 3.0.8 - Inoperability of Snubbers Using the Consolidated Line Item Improvement Process Technical Specification Improvement

ML071410463
Person / Time
Site:	North Anna
Issue date:	05/21/2007
From:	Gerald Bichof Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, NRC/NRR/ADRO
References
07-0360
Download: ML071410463 (19)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 2326 1 May 21 , 2007 U.S. Nuclear Regulatory Commission Serial No. 07-0360 Attention: Document Control Desk NL&OSlETS RO Washington, D.C. 20555 Docket Nos. 50-3381339 License Nos. NPF-417 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)

NORTH ANNA POWER STATION UNITS 1 AND 2 PROPOSED LICENSE AMENDMENT REQUEST

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ADDITION OF LC0 3.0.8 INOPERABILITY OF SNUBBERS USING THE CONSOLIDATED LINE ITEM INIPROVEMENT PROCESS TECHNICAL SPECIFICATION IMPROVEMENT Pursuant to 10 CFR 50.90, Dominion reques'ts amendments, in the form of changes to the Technical Specifications (TS) to Facility Operating License Numbers NPF-4 and NPF-7 for North Anna Power Station Units 1 and 2, respectively. The proposed amendment would modify TS requirements for inoperable snubbers by adding L C 0 3.0.8. The change is consistent with NRC-approved Revision 4 to Technical Specification Task Force (TSTF) Standard Technical Specification Change Traveler, TSTF-372, "Addition of L C 0 3.0.8, Inoperability of Snubbers."

The availability of this TS improvement was announced in the Federal Register on May 6, 2005 (70 FR 24126) as part of the cor~solidatedline item improvement process (CLIIP). Attachment 1 provides a descriptiom of the proposed change, the requested confirmation of applicability, and plant-specific verifications. The marked-up and proposed Technical Specifications pages are provided in Attachments 2 and 3, respectively. The associated marked-up Bas'es changes are provided in Attachments 4 for information only and will be implemented in accordance with the Technical Specification Bases Control Program and 10 CFR 50.59.

The proposed changes have been reviewed and approved by the Station Nuclear Safety and Operating Committee.

Dominion requests approval of the license ;amendments by October 31, 2007 with a 90-day implementation period.

In accordance with 10 CFR 50.91, a copy of this application, with attachments, is being provided to the appropriate designated officials of Virginia.

07-0360 Docket Nos. 50-3381339 Page 2 of 4 If you have any questions or require additional information, please contact Mr. Thomas Shaub at (804) 273-2763.

Very truly yours, Gerald T. Bischof Vice President - Nuclear Engineering Attachments

1. Discussion of Change

2. Marked-up Technical Specification Changes

3. Proposed Technical Specification Pages'

4. Marked-up Technical Bases Changes Commitments made in this letter:

1. The 3.0.8 Bases will be implemented when the NRC-approved Technical Specification for L C 0 3.0.8 is impleme~ntedat North Anna.

07-0360 Docket Nos. 50-3381339 Page 3 of 4 cc: U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW Suite 23T85 Atlanta, Georgia 30303 Mr. J. E. Reasor, Jr.

Old Dominion Electric Cooperative lnnsbrook Corporate Center 4201 Dominion Blvd.

Suite 300 Glen Allen, Virginia 23060 Commissioner Bureau of Radiological Health 1500 East Main Street Suite 240 Richmond, Virginia 23218 Mr. J. T. Reece NRC Senior Resident Inspector North Anna Power Station Mr. S. P. Lingam NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 8-HI 2 Rockville, Maryland 20852

07-0360 Docket Nos. 50-3301339 Page 4 of 4 COMMONWEALTH OF VIRGINIA )

1 COUNTY OF HENRICO )

The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Gerald T. Bischof, who is Vice President - Nuclear Engineering, of Virginia Electric and Power Company. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that Company, and that the statements in the document are true to the best of his knowledge and belief.

Acknowledged before me this Z / 5Tday of \A?-&! ,2007.

My Commission Expires:

I 2 6 1 0 .u (SEAL)

Attachment 1 (Serial No. 07-0360)

Discussion of Change North Anna Power Station Units 1 and 2 Virginia Electric and Power Company (Dominion)

DISCUSSION OF CHANGE

1.0 DESCRIPTION

The proposed amendment would modify technical specifications (TS) requirements for inoperable snubbers by adding LC0 3.0.8.

The changes are consistent with Nuclear Regulatory Commission (NRC) approved lndustryflechnical Specification Task Force (TSTF) STS change TSTF-372, Revision 4.

The availability of this TS improvement was published in the Federal Register on May 4, 2005, as part of the consolidated line item improvement process (CLIIP). The changes include:

Addition of new LC0 3.0.8 to address an inoperable snubber(s) and the associated informational Bases.

Modification of LC0 3.0.1 and its associated Bases to reference the newly added L C 0 3.0.8.

2.0 ASSESSMENT 2.1 Applicability of Published Safety Evaluation Dominion has reviewed the safety evaluation dated April 27, 2005 as part of the CLIIP.

This review included a review of the NRC staff's evaluation, as well as the supporting information provided to support TSTF-372. Dominion has concluded that the justifications presented in the TSTF proposal and the safety evaluation prepared by the NRC staff are applicable to North Anna Power Station Units 1 and 2 and justify this amendment for the incorporation of the changes to the North Anna TS.

2.2 Optional Changes and Variations Dominion is not proposing any variations or deviations from the TS changes described in the TSTF-372, Revision 4, or the NRC staff's model safety evaluation dated May 4, 2005 (70 FR 23252).

3.0 REGULATORY ANALYSIS

3.1 No Significant Hazards Consideration Determination Dominion has reviewed the proposed no significant hazards consideration determination (NSHCD) published in the Federal Register as part of the CLIIP.

Dominion has concluded that the proposed NSHCD presented in the Federal Register

notice is applicable to North Anna and is hereby incorporated by reference to satisfy the requirements of 10 CFR 50.91 (a).

3.2 Verification and Commitments As discussed in the notice of availability published in the Federal Register on May 4, 2005 for this TS improvement, plant-specific verifications were performed as follows:

Dominion has established TS Bases for LC0 3.0.8 which provide guidance and details on how to implement the new requirements. LC0 3.0.8 requires that risk be managed and assessed. The Bases also state that while the Industry and NRC guidance on implementation of 10 CFR 50.65(a)(4), the Maintenance Rule, does not address seismic risk, LC0 3.0.8 should be considered with respect to other plant maintenance activities, and integrated into the existing Maintenance Rule process to the extent possible so that maintenance on any unaffected train or subsystem is properly controlled, and emergent issues are properly addressed. The risk assessment need not be quantified, but may be a qualitative assessment of the vulnerability of systems and components when one or more snubbers are not able to perform their associated support function.

The 3.0.8 Bases will be implemented when the approved Technical Specification for LC0 3.0.8 is implemented at North Anna after NRC approval. North Anna Unit 1 and 2 Technical Specifications have a Bases Control Program consistent with Section 5.5 of the STS.

4.0 ENVIRONMENTAL EVALUATION Dominion has reviewed the environmental evaluation included in the model safety evaluation dated April 27, 2005 as part of the CLIIP. Dominion has concluded that the staff's findings presented in that evaluation are applicable to North Anna and the evaluation is hereby incorporated by reference for this application.

Serial No. 07-0360 Docket Nos. 50-338/339 Attachment 2 (Serial No. 07-0360)

Marked-up Technical Specification Changes North Anna Power Station Units 1 and 2 Virginia Electric and Power Company (Dominion)

LC0 APPLICABILITY 3.0 3.0 LIMITING CONDITION FOR OPERATION (LCO) APPLICABILITY LC0 3.0.1 LCOs s h a l l be met d u r i n g t h e MODES o r o t h e r s p e c i f i e d c o n d i t i o n s i n t h e Appl i c a b i 1i t exce t as provided i n LC0 3.0.2,+ LC0 30.-.

LC0 3.0.2 Upon discovery o f a f a i l u r e t o meet an LCO, t h e Required Actions o f t h e associated Conditions s h a l l be met, except as provided i n LC0 3.0.5 and LC0 3.0.6.

I f t h e LC0 i s met o r i s no l o n g e r appl i c a b l e p r i o r t o expi r a t i o n o f t h e s p e c i f i e d Completion Time(s) , completion of t h e Required Action(s) i s n o t r e q u i r e d unless otherwise stated.

LC0 3.0.3 When an LC0 i s n o t met and t h e associated ACTIONS are n o t met, an associated ACTION i s n o t provided, o r i f d i r e c t e d by t h e associated ACTIONS, t h e u n i t s h a l l be placed i n a MODE o r o t h e r s p e c i f i e d c o n d i t i o n i n which t h e LC0 i s n o t a p p l i c a b l e . A c t i o n s h a l l be i n i t i a t e d w i t h i n 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> t o p l a c e t h e u n i t , as applicable, i n :

a. MODE 3 w i t h i n 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />;

b. MODE 4 w i t h i n 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />; and

c. MODE 5 w i t h i n 37 hours4.282407e-4 days <br />0.0103 hours <br />6.117725e-5 weeks <br />1.40785e-5 months <br />.

Exceptions t o t h i s S p e c i f i c a t i o n are s t a t e d i n t h e individual Specifications.

Where c o r r e c t i v e measures are completed t h a t p e r m i t o p e r a t i o n i n accordance w i t h t h e LC0 o r ACTIONS, completion o f t h e a c t i o n s r e q u i r e d by LC0 3.0.3 i s n o t required.

LC0 3.0.3 i s o n l y a p p l i c a b l e i n MODES 1, 2, 3, and 4.

LC0 3.0.4 When an LC0 i s not met, e n t r y i n t o a MODE o r o t h e r s p e c i f i e d c o n d i t i o n i n t h e A p p l i c a b i l i t y s h a l l o n l y be made:

a. When t h e associated ACTIONS t o be entered permit continued operation i n t h e MODE o r o t h e r s p e c i f i c c o n d i t i o n i n t h e A p p l i c a b i l i t y f o r an unl i m i t e d p e r i o d o f time, (continued)

North Anna U n i t s 1 and 2 3.0-1 Amendments 231/212

LC0 APPLICABILITY 3.0 3.0 LC0 APPLICABILITY LC0 3.0.7 Test Exception LCOs 3.1.9 and 3.4.19 a l l o w s p e c i f i e d Technical S p e c i f i c a t i o n (TS) requirements t o be changed t o permit performance o f special t e s t s and operations. Unless otherwise s p e c i f i e d , a1 1 o t h e r TS requirements remain unchanged. Cornpl iance w i t h Test Exception LCOs is o p t i o n a l .

When a Test Exception LC0 i s d e s i r e d t o be met b u t i s n o t met, t h e ACTIONS o f t h e Test Exception LC0 s h a l l be met. When a Test Exception LC0 i s n o t d e s i r e d t o be met, e n t r y i n t o a MODE o r o t h e r s p e c i f i e d c o n d i t i o n in t h e Appl icabi 1 it y s h a l l be made i n accordance w i t h t h e o t h e r a p p l i c a b l e Specifications.

North Anna U n i t s 1 and 2 Amendments 2311212

LC0 3.0.8 When one or more required snubbers are unable to perform their associated support function@), any affected supported LCO(s) are not required to be declared not met solely for this reason if risk is assessed and managed, and:

a, the snubbers not able to perform their associated support function(s) are associated with only one train or subsystem of a multiple train or subsystem supported system or are associated with a single train or subsystem supported system and are able to perform their associated support function within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; or

b. the snubbers not able to perform their associated support function(s) are associated with more than one train or subsystem of a multiple train or subsystem supported system and are able to perform their associated support function within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

At the end of the specified period the required snubbers must be able to perform their associated support function(s), or the affected supported system LCO(s) shall be declared not met.

Serial No. 07-0360 Docket Nos. 50-3381339 Attachment 3 (Serial No. 07-0360)

Proposed Technical Specifications Changes North Anna Power Station Units 1 and 2 Virginia Electric and Power Company (Dominion)

LC0 APPLICABILITY 3.0 3.0 LIMITING CONDITION FOR OPERATION (LCO) APPLICABILITY LC0 3 . 0 . 1 LCOs sha l l be met during t h e MODES o r other s p e c i f i e d conditions i n t h e A p p l i c a b i l i t y , except as provided i n LC0 3 . 0 . 2 , LC0 3.0.7, and LC0 3 . 0 . 8 . I LC0 3 . 0 . 2 Upon d i scovery o f a f a i l ure t o meet an LCO, t h e Requ i red Actions o f t h e associated Cond i t i ons sha l l be met, except as provided i n LC0 3.0.5 and LC0 3 . 0 . 6 .

I f t h e LC0 i s met o r i s no longer appl i cab l e r i o r t o

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e x p i r a t i o n o f t h e specified Completion Time(s , completion o f t h e Requ i red Action(s) i s not requ i red unless otherwise stated.

When an LC0 i s not met and t h e associated ACT IONS are not met, an associated ACTION i s not provided, o r i f d i rected by t h e associated ACT IONS, t h e un i t sha l l be p l aced i n a MODE o r other spec i f ied condition i n which t h e LC0 i s n o t applicable. Action s h a l l be i n i t i a t e d w i t h i n 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> t o place t h e u n i t , as applicable, i n :

a. MODE 3 w i t h i n 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />;

b. MODE 4 w i t h i n 13 hour1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />s: and c . MODE 5 w i t h i n 37 hours4.282407e-4 days <br />0.0103 hours <br />6.117725e-5 weeks <br />1.40785e-5 months <br />.

Except ions t o t h i s Specification are stated i n t h e individual Specifications.

Where c o r r e c t i v e measures are completed t h a t permit operation i n accordance w i t h t h e LC0 o r ACTIONS, completion o f t h e actions required by LC0 3.0.3 i s n o t required.

LC0 3.0.3 i s only applicable i n MODES 1, 2, 3, and 4 .

LC0 3 . 0 . 4 When an LC0 i s not met, entry i n t o a MODE o r other s p e c i f i e d condition i n t h e A p p l i c a b i l i t y s h a l l only be made:

a. When t h e associated ACT1 ONS t o be entered permit continued operat ion i n t h e MODE o r other s p e c i f i c condition i n t h e Appl icabi l i t y f o r an unl imited period o f time, (cont i nued)

North Anna U n i t s 1 and 2 3.0-1

LC0 APPLICABILITY 3.0 3.0 LC0 APPLICABILITY Test Exception LCOs 3 . 1 . 9 and 3.4.19 a l l o w s p e c i f i e d Techn i ca l Spec i f i c a t i on (TS) requ i rements t o be changed t o permit performance o f spec i a l t e s t s and operat i ons . Un l ess otherw i se spec i f i ed, a l l other TS requ i rements rema i n unchanged. Comp l i ance w i t h Test Except i on LCOs i s opt i ona l .

When a Test Except ion LC0 i s des i red t o be met b u t i s n o t met, t h e ACTIONS o f t h e Test Exception LC0 sha I I be met. When a Test Exception LC0 i s not desired t o be met, e n t r y i n t o a MODE o r other s p e c i f i e d c o n d i t i o n i n t h e A p p l i c a b i l i t y s h a l l be made i n accordance w i t h t h e other applicable Specifications.

LC0 3 . 0 . 8 When one o r more required snubbers are unable t o perform t h e i r assoc i ated support f u n c t i on (s) , any a f f e c t e d supported LCO(s) are not requ i red t o be declared n o t met s o l e l y f o r t h i s reason i f r i s k i s assessed and managed, and:

a . t h e snubbers n o t able t o perform t h e i r associated support funct ion(s) are associated w i t h o n l y one t r a i n o r subsystem o f a m u l t i p l e t r a i n o r subsystem supported system o r are associated w i t h a s i ng l e t r a i n o r subsystem supported system and are able t o perform t h e i r associated support f u n c t i o n w i t h i n 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; o r

b. t h e snubbers not able t o perform t h e i r associated support funct ion(s) are associated w i t h more than one t r a i n o r subsystem o f a m u l t i p l e t r a i n o r subsystem supported system and are able t o perform t h e i r associated support f u n c t i o n w i t h i n 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

A t t h e end o f t h e s p e c i f i e d period t h e requ i red snubbers must be able t o perform t h e i r associated support f u n c t i on(s) , o r t h e affected supported system LCO(s) s h a l l be declared n o t met.

North Anna U n i t s 1 and 2

Serial No. 07-0360 Docket Nos. 50-3381339 Attachment 4 (Serial No. 07-0360)

Marked-up Technical Specifications Bases Changes (For Information Only)

North Anna Power Station Units 1 and 2 Virginia Electric and Power Company (Dominion)

LC0 Appl icabi 1 it y 6 3.0 B 3.0 LIMITING CONDITION FOR OPERATION (LCO) APPLICABILITY BASES

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LCOs LC0 3.0.1 through LC0 3 . 0 . B e s t a b l i s h t h e general requirements appl i c a b l e t o a1 1 S p e c i f i c a t i o n s and apply a t a l l times, unless otherwise stated.

LC0 3.0.1 LC0 3.0.1 e s t a b l i s h e s t h e A p p l i c a b i l i t y statement w i t h i n each i n d i v i d u a l S p e c i f i c a t i o n as t h e requirement f o r when t h e LC0 i s r e q u i r e d t o be met (i.e., when t h e u n i t i s i n t h e MODES o r o t h e r s p e c i f i e d c o n d i t i o n s o f t h e Appl icabi 1it y statement o f each S p e c i f i c a t i o n ) .

LC0 3.0.2 LC0 3.0.2 e s t a b l i s h e s t h a t upon discovery o f a f a i l u r e t o meet an LCO, t h e associated ACTIONS s h a l l be met. The Completion Time o f each Required A c t i o n f o r an ACTIONS C o n d i t i o n i s a p p l i c a b l e from t h e p o i n t i n t i m e t h a t an ACTIONS Condition i s entered. The Required Actions e s t a b l i s h those remedial measures t h a t must be taken w i t h i n s p e c i f i e d Completion Times when t h e requirements o f an LC0 a r e n o t met.

his S p e c i f i c a t i o n e s t a b l ishes t h a t :

a. Completion o f t h e Required Actions w i t h i n t h e s p e c i f i e d Completion Times c o n s t i t u t e s compl iance w i t h a Speci f ic a t ion; and

b. Completion o f t h e Required Actions i s n o t r e q u i r e d when an LC0 i s met w i t h i n t h e s p e c i f i e d Complet i o n Time, unless otherwise s p e c i f i e d .

There are two basic types o f Required Actions. The f i r s t t y p e o f Required A c t i o n s p e c i f i e s a time l i m i t i n which t h e LC0 must be met. This t i m e 1 i m i t i s t h e Completion Time t o r e s t o r e an inoperable system o r component t o OPERABLE s t a t u s o r t o restore variables t o w i t h i n specified l i m i t s . I f t h i s t y p e o f Required A c t i o n i s n o t completed w i t h i n t h e s p e c i f i e d Completion Time, a shutdown may be r e q u i r e d t o place t h e u n i t i n a MODE o r c o n d i t i o n i n which t h e S p e c i f i c a t i o n i s not applicable. (Whether s t a t e d as a Required A c t i o n o r not, c o r r e c t i o n o f t h e entered C o n d i t i o n i s an a c t i o n t h a t may always be considered upon e n t e r i n g ACTIONS.) The second type o f Required A c t i o n s p e c i f i e s t h e remedial measures t h a t permit continued o p e r a t i o n o f t h e (continued)

North Anna U n i t s 1 and 2 0 3.0-1 Revision 0

LC0 Appl icabi 1it y B 3.0 BASES LC0 3.0.7 The Appl i c a b i 1i t y o f a Test Exception LC0 represents a (continued) c o n d i t i o n n o t n e c e s s a r i l y i n compliance w i t h t h e normal requirements of t h e TS. Compliance w i t h Test Exception LCOs i s o p t i o n a l . A s p e c i a l o p e r a t i o n may be performed e i t h e r under t h e p r o v i s i o n s o f t h e appropriate Test Exception LC0 o r under t h e o t h e r a p p l i c a b l e TS requirements. I f i t i s d e s i r e d t o perform t h e special o p e r a t i o n under t h e p r o v i s i o n s o f t h e Test Exception LCO, t h e requirements o f t h e Test Exception LC0 s h a l l be f o l l owed.

North Anna U n i t s 1 and 2 Revision 0

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INSERT 2 Bases L C 0 3.0.8 L C 0 3.0.8 establishes conditions under which systems are considered to remain capable of performing their intended safety function when associated snubbers are not capable of providing their associated support function(s). This L C 0 states that the supported system is not considered to be inoperable solely due to one or more snubbers not capable of performing their associated support function(s). This is appropriate because a limited length of time is allowed for maintenance, testing, or repair of one or more snubbers not capable of performing their associated support function(s) and appropriate compensatory measures are specified in the snubber requirements, which are located outside of the Technical Specifications (TS) under licensee control. The snubber requirements do not meet the criteria in 10 CFR 50.36(c)(2)(ii), and, as such, are appropriate for control by the licensee.

If the allowed time expires and the snubber(s) are unable to perform their associated support function(s), the affected supported system's LCO(s) must be declared not met and the Conditions and Required Actions entered in accordance with L C 0 3.0.2.

L C 0 3.0.8.a applies when one or more snubbers are not capable of providing their associated support function(s) to a single train or subsystem of a multiple train or subsystem supported system or to a single train or subsystem supported system. L C 0 3.0.8.a allows 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to restore the snubber(s) before declaring the supported system inoperable. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Completion Time is reasonable based on the low probability of a seismic event concurrent with an event that would require operation of the supported system occurring while the snubber(s) are not capable of performing their associated support function and due to the availability of the redundant train of the supported system.

L C 0 3.0.8.b applies when one or more snubbers are not capable of providing their associated support function(s) to more than one train or subsystem of a multiple train or subsystem supported system. L C 0 3.0.8.b allows 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> to restore the snubber(s) before declaring the supported system inoperable. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Completion Time is reasonable based on the low probability of a seismic event concurrent with an event that would require operation of the supported system occurring while the snubber(s) are not capable of performing their associated support function.

In order to use L C 0 3.0.8 for an inoperable snubber(s) the following conditions required by the NRC must be satisfied:

At least one AFW train (including a minimum set of supporting equipment required for its successful operation) not associated with the inoperable snubber(s), must be OPERABLE when L C 0 3.0.8.a is used.

At least one AFW train (including a minimum set of supporting equipment required for its successful operation) not associated with the inoperable snubber(s) must be OPERABLE, or some alternative means of core cooling (e.g., feed and bleed, fire water system, or "aggressive secondary cooldown" using the steam generators) must be available when L C 0 3.0.8.b is used.

Confirm that at least one train (or subsystem) of systems supported by the inoperable snubbers would remain capable of performing their required safety or support functions for postulated design loads other than seismic loads. L C 0 3.0.8 does not apply to non-seismic snubbers.

addition, L C 0 3.0.8 requires that risk be assessed and managed.

Industry and NRC guidance on the implementation of 10 CFR 50.65(a)(4)

(the Maintenance Rule) does not address seismic risk. However, use of L C 0 3.0.8 should be considered with respect to other plant maintenance activities, and integrated into the existing Maintenance Rule process to the extent possible so that maintenance on any unaffected train or subsystem is properly controlled, and emergent issues are properly addressed. The risk assessment need not be quantified, but may be a qualitative awareness of the vulnerability of systems and components when one or more snubbers are not able to perform their associated support function.