ML17338B292
| ML17338B292 | |
| Person / Time | |
|---|---|
| Site: | Indian Point, Surry, North Anna  |
| Issue date: | 07/09/1979 |
| From: | Lainas G Office of Nuclear Reactor Regulation |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17338B293 | List: |
| References | |
| NUDOCS 7908020038 | |
| Download: ML17338B292 (6) | |
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UNITEDSTATES NUCLEAR REGULATORY COMMISSION'ASHINGTON.'.
C. 20555 JU,g le79 J
MEMORANDUM TO:
D. Eisenhut, Acting Dir'ector, Division of Operating Reactors FROM:
SUBJECT:
G. Lainas, Chief,. Plant Systems
- Branch, DOR STEAM GENERATOR WATER LEYEL We have recently received copies of an LER from Indian Point 3, a P/N from YEPCO and-a Part 21 from Westinghouse (enclosed), all related to possible inaccuracies in steam generator.
water level indication.
Westinghouse has advised us and thei,r customers of corrections that should be applied to steam generator water level to account for high environmental temperatures;resulting from postulated accidents.
We have discussed this matter with I8E'nd they. plan to take action to ensure that the affected licensees take the appropriate action.
I8E is also considering a Bulletin since this may be a co@non problem in
. other reactor designs.
We would.recommend'uch action. and also by copy of this memorandum are advising that the boards 'be notified.
Essentially, the problem concerns corrections. to the steam generator low water level and/or containment high pressure-.protection system setpoints.
These corrections are necessary to account 'for environmental temperature effects to the steam generator water level, reference columns and corrections due to changes:
in. steam generator fluid densities.
In
. addition, Westinghouse has advised their customers, that boiling could conceivably.'oc'cur in the.reference legs: following depressurization, and
'ould cause erroneous indications.
We do not.have the specific recommend-ations and emergency operating procedures that. Westinghouse is providing their customers,
- however,
.ISE i's in.the process of obtaining them.
We would recoamend that. this item be the subject.of a Board Notification and that I8E keep us advised of the actions of.the l.icensees
. G. Lainas',
Ch~ef PTant System/ Branch Division of Operating. Reactors cc:
.See next page, C
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Contact N. Chiramal X-28077'c w/enclosure:
L. Nichols cc w/o enclosure:
V. Stello S.
Hanauer F. Schroeder R. Satteri'ield
.DOR AD's E. Jordan V. Thomas P.
Check DOR Project BC's D. Yassallo
'D..Tondi iaaf. 'Chiramal E. Butcher I,
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PRELDfINARY NOTIFICATION PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE-, -PNO-79 l85 This r'elimina
.notification. constitutes EART'Y notice of aa event POSSIBLE..safet or ubl'ic interest. si ificaace.
,The information'esented is es iaitiall received without verification or evaluation and is basicall all that is known b XE staff on this date.
'ACILITY:
Virgiaia Electric and Power Company North Anna and Surry Power Stations Docket Nos.
50-338, 50-339, 50-280 and 50-281 Mineral and Surry, Virginia SUMECT:
HONCONSERVATIVE ANALYSIS. RESULTS OF HIGH ENERGY LZhr. BREAK INSIDE CONTAXNKUG'estinghouse informed their customers and provided a verbal Part 21 report to XGB of a aoaconservative analysis results of high euergy pipe break accidents inside containment specifically concerning errors generated ia the stream generator level indication sensors.
Mestinghouse informed Virginia Electric and Power Company of-these results oa. June-21, 1979.
Xa the case of a feedvater pipe break, where containmeat temperatures could reach
.. 280 degrees F, the higher temperature would affect the steam generator level reference leg causing a +10 percent level error.
'This error would delay initiation of -a steam generator low-low level indication and, therefore, delay initiation of auxiliary feedwatcr.
'The analysis for a main steam line break in containment generates,a 400 degree, F contain-ent temperature and a +21 percent error in steam.generator level.
The licensee is evaluating this information and. intends to generate supplemental orders to their customers.
Media interest is not expected.
Neither the licensee. nor the hRC. plan a
. news release.
The Cemoawealth of Virginia has been informed.
North Anna Unit 1 is operating, Surry Units 1 and 2 are shutdo~m for long. term maintenance..
Region II (Atlanta) received notification. of this occurrence by telephone from the Surry resident inspector at 9:00 a.m..on June 22.
Contact:
G. Klingler, XE'28019; F. Nolan, IE x28019; S. Bryan, 1E x28019 H St ~~<
Distribution:
Transmitted Chairman Hendrie Commissioner Kennedy.
Cotezissioner.Giliasky Transmitted:
HNBB V. Gossick, EDO H. L. Ornstein, EDO J. J. Fouchard, PA N. M. Hall'er, HPA R.
G. Ryan,.
OSP H'. 'Shapar, ELD Commissioner. Bradford:
Commis's ioner'. Ahea me ACRS q:cY'P-.
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, H..R. Denton,,
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..R.. C.. DeYoung, NRR R; '-,J.'Hattson,
'.. D'. Vassallo; 'NRR
.D.. 'Essenhst',"J SS Bids ~l.>ss-
"M."J'. 'Dircks NHSS
,S.. Levine, RES S. J. Chilk, SECY C.
C. Xammerer, CA (For Distribution)
V. Stello, XE Region. Zf (HAlL),
J. J.,Cummings,,;OIA R.. Minogue,,,'SD PRELLMINARY dOTIFICATIeg,'.
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