ML16340A418

Board Notification:Recent Issue on nonsafety-grade Equipment to Mitigate Transients.More Info Is Required

ML16340A418
Person / Time
Site:	Mcguire, Harris, North Anna, Diablo Canyon, McGuire, 05000514, 05000515, 05000471, 05000516, 05000517, 05000580, 05000581, Atlantic Nuclear Power Plant, Perkins, Skagit, Black Fox, Crane
Issue date:	03/16/1979
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Vassallo D Office of Nuclear Reactor Regulation
Shared Package
ML16340A417	List: ML16340A416 ML16340A418 ML16341B172
References
TASK-AS, TASK-BN-79-12, TASK-TF, TASK-TMR BN--79-12, BN-79-12, NUDOCS 7905010198
Download: ML16340A418 (38)

Text

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'C 7+g cv W**p4 UNITED S1DTES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 MAR 16 579 MEMORANDUM FOR:

D. B. Vassallo, Assistant Director for LWRs, DPM FROM:

" 'R. L. Tedesco, Assistant Director for Reactor

Safety, DSS

SUBJECT:

BOARD NOTIFICATION RECENT ISSUE ON NONSAFETY-GRADE EQUIPMENT (NSGE)

TO MITIGATE TRANSIENTS In analyzing anticipated operational occurrences (AOO), applicants (particularly BWRs) have relied upon normal operating equipment to mitigate the-severity of the events.

This equipment is not specifically qualified'o seismic Category I or IEEE-279 requirements'and has been termed nonsafety-grade equipment (NSGE); e.g.,

turbine bypass valves, relief valves, high water level trip, feedwater flow control, and pressure regulator.

The reliability of such equipment has not been systematically evaluated by the staff and the issue focuses on the system design criteria that should be establishedfor such equipment which is relied upon for mitigation, but to a lesser degree than required for other. more severe events such as a

LOCA or main steam line break.

NRC Office Letter No.

19 calls for a determination of the safety significance of new information by evaluating "whether this information could reasonably be regarded as putting a new or different light upon an issue before boards or as raising a new issuq."

Staff evaluation>>has reached a stage which concludes that this matter could be interpreted as raising a new issue.

More information from a source or sources external to the staff is required to further study this issue.

I there-fore conclude that the notification test is met.

In accordance with NRR Office Letter No.

19 requirement, I am providing you the following:

1.

The item for notification 2.

Consi'derations regarding relevancy and materiality 3.

Statement on perceived significance 4.

Relation to projects

Contact:

T.'. Novak, NRR 49-27460

D. B. Vassallo 1.

The Item In the analysis of anticipated operational occurrences (AOO) credit has been given to non-safety grade equipment (NSGE) performing their normal function which can result in significant reductions with regard to the severity of the transient.

The staff has not reviewed the design requirements for this equipment.

Most of the equipment, however, is in normal plant usage in various control systems.

2, Relevanc and Materialit The issue is relevant to evaluating the consequences oftransients for all LWRs; however, it appears to be of particular concern for BWRs at this time.

In over 170 reactor years of normal BWR operations there'as been no reported abnormal operational occurrence which has resulted in exceeding a technical specification safety limit.

Based on this operating experience, we believe the real probability of an antici-pated transient combined with an undesirable control system response which would result in violation of fuel damage criteria is low.

However, General Design Criterion 29 states:

"Protection a ainst antici ated o erational occurrences.

The protection and reactivity control systems shall be designed to assure an extremely high probability of accomplishing their safety functions in the event of anticipated operational occurrences."

I In addition, 10 CFR 50.55a, "Codes and Standards,"

Section (h) requires that protection systems meet the appropriate edition of IEEE Std. 279.

These criteria have been applied to the primary reactivity control

systems, e.g.,

the reactor scram system and to safety systems, e.g.,

ECCS.

While operating experience indicates that there is no immediate safety significance to this issue, the General Design Criteria suggest that additional reviews to ensure adequate thermal margins is warranted.

Such margins could come in the form of additional equipment surveillance requirements, equipment modifications, or reanalyses of'ertain anticipated transients without taking credit for nonsafety-grade equipment (thereby affecting operating limits).

D. B. Vassallo MAR > 6 879 4.

Relation to Pro ects This relates primarily to BWRS.

Since we view this issue as not having an immediate safety significance, operating reactors would be expected to await the outcome of our future reviews.

Appropriate boards should be aware of this issue and of the staff's plans to continue to evaluate its significance with regard to the acceptability of BWR transient analyses.

It is anticipated that initial decisions on the direction of resolution on this issue would be available in 1979.

Robert L. Tedesco, Assistant Director for Reactor Safety Division of Systems Safety cc:

R. Mattson V. Stello T. Novak R. Satterfield V. Benaroya G. Mazetis S. Israel R. Frahm W. Mills C. Graves S.

Hanauer

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DRAL "lUC~R ~~ULATOR~ Cpl:2'ESiON 1990 North California Boulevard Suite 202 Nalnu t C re ek Ca.

94596.

am strongly a>ainst any nuclear gower gla..ts here in Cali orn>>a.i am against anything got-entially hazardous tothe health o.

my loved ones, family, friends h mankind.

Until (if ever

) nuclear ower groduction is prpven sa.e in all -ase.s i'm or pursue'n.-,

al ernate o

ms (such as sola.

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i sgea,k for myself, my w',our families and A )~t

+ 7t+ QAds ALL SAY:

S'POP TH" DiABLO CANYON NUCIZAR PpbZR PLANT.

i hoge our oginions will make Actions that will make this world, a safer glace to li ve.

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irperson, eral Nuclear Regulatory Commision!

0 North California Boulevard, Suite 202'ut Creek, California, 94596 March 21, 1979 i

'L<y,c)g V g whom it may concern:

I am writing my viewpo3.nts on Nuclear Po~er Plants.

m 15 years old and I do not want to live in a world where nuclear er is the only solution to the energy shortage.

It is extremely gerous and you act as if nothing could go wrong.

You are not letting public know just how dangerous nuclear power really is.

Shy take a chance on nuclear power when you could spend some more ey and more effort on other solutions to the energy shortage7 Such Solar Energyl Is it really worth the risk and the inhumane danger of using nuclear er when all you have to do is spend some more money and use more effort' I know your minds don't think this way but maybe you will get some se out of this letter.

Hoping "fg'/r for a safe and more humane society,

((

Julie R. Horoeitz

'I A citizen of Los Angeles

UNITED STATES, OF Au%RICA NUCLEAR REGULATORY COM1ISS ION In the Hatter of

)

.)

PACIFIC GAS AND ELECTRIC COMPANY )

)

(Diablo Canyon Nuclear Power

)

Plant, Units 1 and 2)

)

)

)

)

Docket No.(s) 50-275 50-323 CERTIFICATE OF SERVICE I hereby certify that I have this day served the foregoing document(s) upon each person designated on the official service list compiled by the Office of the Secretary of the Commission in thi.'s proceeding in accordance with the requirements of Section 2.712 of 10 CFR Part 2-Rules of Practice, of the Nuclear Regulatory Commission's Rules'nd Regulations.

Dated at Washington, D.C.

this'g) day of

'Pw4.L 197/

/I Offic'e 'of the Secretary of the Commission

UNITED STATES OF AMERICA NUCLEAR REGULATORY COiRfISSION 0

In the Hatter of

)

)

PACIFIC GAS AND ELECTRIC COMPANY )

)

(Diablo Canyon, Units 1 and 2)

)

Docket No.(s) 50-275 50-323 SERVICE LIST Elizabeth S. Bowers, Esq.,

Chairman Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission 4'ashington, D.C.

20555 Mr. Glenn O. Bright Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission Vashington, D.C.

20555 Dr. William E. Hartin Senior Ecologist Battelle Memorial Institute

Columbus, Ohio 43201 Mr. Frederick Eissler Scenic Shoreline Preservation Conference, Inc.

4623 More Ifesa Drive Santa Barbara, California 93105 Hrs. Sandra A. Silver 1792 Conejo Avenue San Luis Obispo, California 93401 Hr. Gordon Silver 1792 Conejo Avenue San Luis Obispo, California 93401 Paul C. Valentine, Esq.

321 Lytton Avenue Palo Alto, California 94302 Counsel for NRC Staff Office of the Executive Legal Director U.S. Nuclear Regulatory Commission Hashington, D.C.

20555 Yale I. Zones, Esq.

100 Van Ness Avenue 19th Floor San Francisco, California 94102 Philip A. Crane, Jr.,

Esq.

Pacific Gas and Electric Company 77 Beale Street Room 3127 San Francisco, California 94106 Brent Rushforth, Esq.

" Center for Law in the Public Interest 10203 Santa Monica Drive Los Angeles, California 90067 Hrs. Elizabeth Apfelberg 1415 Cozadero San Luis Obispo, California 93401 David F. Fleischaker, Esq.

1075 15th Street, N.H.

Washington, D.C.

20005 Janice E. Kerr, Esq.

California Public Utilities Commission 5246 State Building San Francisco, California 94102 Arthur C. Gehx, Esq.

Snell and Uilmer 3100 Valley Center Phoenix, Arizona 85073 Mrs. Raye Fleming 1920 Mattie Road Shell Beach, California 93440 Bruce Norton, Esq.

3216 North Third Street, Suite 202 Phoenix,'rizona 85012 Mr. Carl Neiburger San Luis Obispo Telegram-Tribune P.

O. Box 112 San Luis Obispo, California 93406 Mr. James

0. Schuyler Nuclear Projects Engineer Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 FOR INFORMATION Mr. James Hanchett Public Affairs Officer, Region V

U.

S. Nuclear Regulatory Commission 1990 cnorth Califognia 13oulev~ard, Suite 2

Waxnur-Creek, California 94556

Board and arties c ntinued 50-275,

-323 Richard S.

Salzman, Zsq.,

Chairman Atomic Safety and Licensing Appeal Board U.S. 'Nuclear Regulatory Commission Washington, D.C.

20555 Dr. !f. Reed Johnson Atomic Safety and Licensing i.'.ppeal Board U.S. Nuclear Regulatory Commission Hashington, D.C.

20555 Alan S. Rosenthal, Fsq.

Atomic Safety and Licensing Appeal Board U.S. Nuclear Regulatory Commission bashington, D.C.

20555

9% xTEO (:01'GG'St VERDE'i'~}rs.

Elisabeth Bo>>'ers Atomic Safety and Licensing Board U. S. Nucleal Ikegul atory Co!m!Iis sion h'ashin

ton, D.C.

20555

~}sc ch

>9 ig7q

<<<<vv('a a'(<<

'i c

ra

<<4 0

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~~/ I~I 'I RL':

Diablo Canyon nuclear power plane, Danke; yoa

~l]->75 ib Jla Dear <Irs.

Bo>>ers, lntervenors apologi".e for not submitting proposed findings of fact on the adequacy of the Diablo Canyon plant security system.

4'e >>'ere of cou1 sc unable to make such proposed findings because>>'e>>'ere denied access to the evidence, and barred From the hearing on the security p 1'ln.

please order my name at the above address placed on the service list for this proceed}.ng.

Sincerely,

,Igl(),.g Andre>>

Ba ld>> in Attorney for In:cr:enors/

I.uis Obis}Io ~totheI s for I'e Ice.

El i =.abeth Apfe 1 berg, and I.:coloy Action Club

!AYB:cr

A-':.,:,

U i~I ITF D 5TPc 7 E5 O." h ~!E R E Ccl.

Hl!CI I::AR Rl.".GUIANA'i'ORY <:O~I:>.I.':S EO."

+i'e/)g~

Before th(.'tomic Sil fctv ln(!

! (:('>)'(1 Bo! 1:i.'.

)

)

Pr~CEFEC G~S

~V,D I'.I.,I'.CTnEC CO.

)

)

(Diablo Canyon boucle

!r PoweI

)

Plan, Units 1

ancl 2)

)

ln the (~latter of Docket i~~os.

>0-? I a 50-3?3 CEIETEEECATE OF S'V ICE I hereby certifv that the for-goinc; lntcrvcnor>>'as been served as of this date by personal c'.elivery first class rai1.,

postage

prepaicI, to

'.he following:

O. L.

O. L.

A Cc P

l(vspon>>c or Mrs. Elizabeth hpfelberg 1115 Cozadero San I.uis Obispo, CP 93401

><Irs.

Raye Fleming 1920 Hattie RcI Shell Beach, CP!

934~19 Hr. t."rederick I".iss1(1 r Scenic Shor-line Preservation Collference, Enc.'

I()23 )lore Mesa Dr Santa

Barbara, CP 93105 John R.

Phi lli!)s, Esq.

Simon K levansky, Esq.

~largaret Blodgett, Es(I.

Center for Law in the Public Enterest 10203. Santa

(~!or.ica Dr.

Los P nc:,eies, CP 90067

.Janice j:. Kerr I,awrence Q.

C~arc'a Cal'ornia Public Utilities Commission 5? <I 6 State Building 350:!chil.ister St.

San F anc.isco, CA 9~102 Firs.

Sandra S i1ve r 1792 Cone jo Ave San Luis 0I)1spo,

( 6 93401 Atomic Sa1e'ty and Licens inc 13oarcl Panel U. S.,'Iuc lear Regulatory Corlnission

'i 1shinclton, D.C.

20555 Docketing and Service Section Office of the Secretary U.S. nuclear Regulatory Com.

! ashington, D.C.

20555 EliZabeth S.

BOWerS, Chairmcln P tonic Safety and Licensinr.

Boar(!

Pane3~

U. S.

Nuclear Regula torv Comm'sion lta shin(I "or.,

D. C.

20555

,~Ir. Glen O. Bric;ht i~tornic Safety a!ld Licensing Boa Ld Pane l U. S. 'Nuclear Regulatory Com.

Nashington, D.C.

20555 D

. 'i'z.ll'an E.

a<art Senior Ecologist Bat telle.~lemoriai Enstirute Col u bus, OII ~3201

e

David F. Fleischakc r, Esq.

1025 15 th S tree t, N. 4.

5th Floor hashing ton, D. C.

20005 James R. '1'ourtellotte, Esq.

L.

Dow Davis, Esq.

Richard Goddard, Esq.

Lawrence

Drenner, Esq.

Office of Executive Legal 9irec"or DETii 0'12 U. S. Nuclear Regula tory Commission

- 4'ashing ton, D. C.

20555 Philip A. Crane, Jr.,

Esq.

Pacific Gas and Electric Company 77 Deale Street Rm.

3127 San Francisco, CA 94106 Arthur C. Gehr, Esq.

Snell

& Ni lmer 3'00 Valley Center

Phoenix, AZ 85073 Bruce Norton, Esq.

3216 North 3rd Street Suite 202 Phoenix',

P7, 85012

1

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