ML19344F186

Forwards Requests for Addl Info Re Adequacy of Station Electric Distribution Sys Voltages to Continue Review. Response Requested within 45 Days of Ltr Receipt

ML19344F186
Person / Time
Site:	Point Beach
Issue date:	09/08/1980
From:	Clark R Office of Nuclear Reactor Regulation
To:	Burstein S WISCONSIN ELECTRIC POWER CO.
References
TAC-12955, TAC-12956, NUDOCS 8009120575
Download: ML19344F186 (6)

Text

p,.a a4%q y) f j'1 UNITED STATES f

g NUCLEAR REGULATORY COMMISSION a

j WASHINGTON, D. C. 20665 g

September 8, 1980 Dockets Nos. 50-266 and 50-301 Mr. Sol Burstein 2xecutive Vice President Wisconsin Electric Power Corrpany 231 West Michigan Street Milwaukee, Wisconsin 53201

Dear Mr. Burstein:

_ In conducting our review of your letter of October 12, 1979 relating to the adequacy of station electric distribution system voltages at Point Beach Nuclear Plant Units No.1 and 2, we have determined that we will need additional information identified in the enclosure to continue the review.

In order for us to traintain our review schedule, your response is requested within 45 days of your receipt of this letter.

~

? lease contact us if you have any questions concerning this request.

Sincerely, d

'ohert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing

Enclosure:

Request for Additional Information cc w/ enclosure:

3ee next page f

c. -

8009120575 f-f

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I Mr. ' Sol Burstein

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Wisconsin Electric Power Cocpany cc: Mr. Bruce Churchill, Esquire Mr. William Guldemond

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Shaw, Pittman, Potts and Trowbridge USNRC Rcsident Inspector's Offic 1800 M Street, N.W.

6612 Nuclear Road Washington, D. C.

20036 Two~ Rivers Wisconsin 54241 Joseph Mann Library 1516 Sixteenth Street Two Rivers', Wisconsin.54241 Mr. Glenn A. Reed, Manager Nuclear Operations Wisconsin Electric Power Conpany Point Beach Nuclear Plant 6610 Nuclear Road Two Rivers, Wisconsin 54241 Walter L. Myer Town Chairman Town of Two Creeks Route 3 Two Rivers, Wisconsin 54241 Ms. Kathleen M. Falk General Counsel Wisconsin's Environmental Decade 302 E. Washington Avenue Madison, Wisconsin 53703 Director, Tech'nical Assessment Division Office of Radiation Programs (AW-4E9)

U. S. Environmental Protection Ag'ency Crystal Mall #2 Arlington, Virginia 20460 U. S. Environmental Protection Agency Federal Activities Branch Region V Office r

ATTN:

EIS COORDINATOR l

230 S. Dearborn Street Chicago, Illinois 60604 i

Chairman

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Public Service Comission of Wisconsin Hill Farms State Office Building Madison, Wisconsin 53702 l

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Reques't fcr Additie:a1 Infctsar* _

Pois: 3each Nuclear Plan:- 1 &.2

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Adequacy of Station Eleciric, Distribution Syrtes Voltages h

EEF:

1.

N1C generic letter dated August d, 19*9

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2.

Viscensin Ele::ric Pever Ce:parc le::er 7

October 12, 1979 a.

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!= crder to evaluate the Fcia: 34ach Adequa:7 cf Sta:i: Oistributien System -

'4 Voltages under the conditions as spelled ou; by the NEC 1: their generic le :er i

dated Augus: 3, 1979, re details are needed. The evalua:ica is also simplified if the analysis is vri::e in the for:a:

cf the guidelines e: losed with :he NRC generic letter. Additic a1 de: ails are :eeded c: :he follevi:g guideline iters.

1.

Separa:'.'.alysis should be perfer:ed as s==ing :he power so-::e :o saf2:f buses is (a) the : i: auxiliary

ansfor:er; (t) :he startup transfer:gr; and (c) other available cer ee icas :o :he effsi:e re:verk ene-by-ene as s e:.'_* s-.'e _ee~d.# c e.' e -..'. r. e.-

• s." -.* *..* a. =. d

'.e, (1) an a::icipated transien (e.g., uni: : rip) er (2) as accide :, whichever presents the lar$es: lead de:2nd situatics.

Docu:en: the lead paths used for calculatices :: each available transfor:er and state the assu=p icn used to

..,s,.-

.,a..es.

,,4a s,_,

.2 s.,ca. a..._.

y..

.m.

.s s

1.

For culti uni: s:a: ices a separate analysis sheuld be

.e.4: _e.2 4-.

ca.._._. ass ___.,.

(.,,3 a_ a., 2...e._.,._.s_e r..

_s u._.

s. e.4 _.. a.a., _. e.2 a.2 s4.__.i.ane...s s.2._....._,..s a.,,

3 c.s..e....a.s a.

.w...a. s. a. s._., c.

(.,%

a._ a._. s s., a.,2.....a s-at..

4-

.st... _. <.. s. t.4.. a_a.;_ t.

(,.. s.

2 -

_s

..._.4..

4.T a__.a

...re s ' _..'

• a e - ~ s s '..." -"...# a.'.' <... a. _.' s a.

...a. s.a.<..

whichever presents the larges: 1:ad de:and situatic.

Occutent that a separate analysis was perfer:ed fer each uni:

...a....< __...._.a.u_

=-g

<, e..s o.:

3 s.z,,a_.,....s...

3.

All attices the ele::ric pever syste: is desig=ed Oc aute-

=a:ically initiate sh:ald be ass==ed te :::ur as designed (e.g., au:czatic hulk Or se:uential leading er au:::ati:

..a.2.,. s.e.._.

..a s.4t s

..e s._.A

..a._s.._,... a,4.s,. -. -

.s. me.1

.J

...,..> e.a s

s.

.a u

-e

..s.2,...s

s....<-

c

..a..

......s safe:y leads (e.g., :::densate pu=;si.

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Document what loads are automatically initiated and for the 2

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purpose of calculations what large non-safety load will be

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f considered to be started-5 5

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4.

Manual load shedding should not be assumed.

5

=j Document that no manual load shedding has been assumed.

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3 5.

For each event analyzed, the maximum load necessitated by the event and the mode of operation of the plant at the ti=e

_i of the event should be assumed in addition to all loads caused g

by expected automatic actions and manual actions permitted by l+

administrative procedures.

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Document that the maxi =um load for each calculation path is assumed

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in addition to all other expected loads.

i 6.

The voltage at the ter=inals of each safety load should be cal-culated based on the above listed considerations and assumptions and based on the assu=ption that the grid voltage is at the T,

" mini =um expected value."

The "minicum expected value" should 5

be selected based on the least of the following:

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a.

The =inimus steady-state voltage experienced at the con-nection to the offsite circuit.

b.

The mininua voltage expected at the connection to the off-site circuit due to contingency plans which =ay result in r

reduced voltage fro = this grid.

c.

The =ini=u= predicted grid voltage from grid stability analysis (e.g., load flow studies).

5 Decument the selection of the "nini=us expected value."

Document rh

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the.results of the calculations with the above considerations

.w showing in particular the voltage on the sost distant load on I

each safety bus at the time of startup of the large non-safety Icad.

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i In the report to NRC on'this matter the licensee should 3i state planned actions, including any proposed " Limiting.

Conditions for Operation" for Technical Specifications, in response to experiencing voltage at the connection to

=the offsite circuit which is less than the " minimum expected value." A copy of the plant procedure in this regard should be provided.

f How does the licensee plan to meet this requirement for planned

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action in the event of voltages less than the "sinimum expected

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F value."

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7.

The voltage analysis should include docu=entation for each condition analyzed, of the voltage at the input and output of each transf ormer and at each intermediate. bus between the con-(

nection to the ~ offsite circuit and the terminals of each safety f

load.

s Docunent the voltages at the input and output of each transformer at each inter:ediate bus based on the conditions set by the pre-ceding guidelines.

9.

The calculated voltages at the terminals of each safety load should be cocpared with the required voltage range for normal operation and starting of that load.

Any identified inade-quacies of calculated voltage require i==ediate remedial action and notification of NRC-Document this comparison with the cciculations as they were completed with the above guidelines.

10.

For each case evaluated the calculated voltages en each safety bus should be co: pared with the voltage-time settings for the undervoltage relays on these safety buses. Any a

identified inadequacies in undervoltage relay settings require i==ediate re=edial action and notification of NRC.

i4-Document that this co=parison was completed.

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=

13.

Analysis documentation should include a statement of the assumptions for each case analyzed.

b State what assumptions were used in calculating each case.

=

f:

E What actions were taken to determine if there are any events or conditions which could result in the simultaneous or consequential loss of both required circuits to the offsite network to determine if any potential exists for violation of GDC-17? What are the results of these actions?

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