ML19309F469

LER 80-022/01T-0:on 800415,util Informed of Possible Deficiency in FSAR Section 14.3,boron Dilution Incident,For Case When RCS Is Drained to Hot Leg w/1% Shutdown Margin. Cause Not Stated.Procedures Changed

ML19309F469
Person / Time
Site:	Calvert Cliffs
Issue date:	04/25/1980
From:	Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309F455	List: ML19309F454 ML19309F469
References
LER-80-022-01T, LER-80-22-1T, NUDOCS 8004290484
Download: ML19309F469 (2)

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lo l i 8l 9l M I LICENSEE 0 ! C lCODE C I N 14I i l@l 0101 - 1010101010 LICENSE NUMBER l 101025l@l26 41111 h 11 l@l57 CAT LICENSE TYPE JO I

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7 15 CON'T 10111 7 8 3C"CI60 l L l@l 01DOCK 61 S lET01010 NUMBER l 311 68 17 l@l 69 EVENT 01411 D ATE 151810 l@l0 l a I?80 l s l a I n 74 75 REPORT D ATE EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h-I l oj 2 l l Mr. Mnnte Conne7- frnn the nivicinn nf ornjaet Man 3ge-ant infgv.,gd 931+4 gre io ia i i Gas & Electric (BG&E) of a possible deficiency ir FSAR safety analysis section I iO i4 l l 14.3 (Boron Dilution Incident) which may apply to Calvert Cliffs Units 1 and 2 I l o i s i 1 (Docket Mos. 50-317, 50-318) T.S. 6.9.1.8.h. The analysis does not address the I iO is i i case when the reactor coolant system (RCS) may be drained to the hot leg with a j

[T;7 l 1% shutdown margin. This condition may occur during maintenance. This is not I I

iOial l a repetitive occurrence. 80 DE CO E SLSC E COMPONENT CODE SUBC dE S E 1o191 l Z I Z l@ [B_J@ l A l@ lZ lZ lZ lZ lZ IZ j@ LZ_l@ LIJ 18 19 20 7 8 9 10 11 12 13 OCCUR AENCE REPORT REVISION SE QU ENTI At.

EVENT YEAR R EPORT NO. CODE TYPE NO.

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44 33 34 35 CAUSE DESCRIPTION AND CC ARECTIVE ACTIONS l

li l 0 l l BG&E has detemined that while coeratino in the condition described. there mav t i ii i I not be a sufficient safety marain; therefore. orocedures have baan channed +n I i,i2i i require a 2% shutdown marain or all sources of nonborated water restricted tn i 11 : 3l l < 88 gpm. when the RCS is drained. In addition, a technical soecification amend- I lii4i Iment has been requested to address the abova conditinn. I 80 7 8 9

% POWER OTHER STATUS 01 O RY DISCOVERY OESCPIPTION ST S IiI5l [EJ @ l 11 Ol Ol @ l NA I LoJ@l Talananna nn+4<4cA+4nn <re- "or i A TIVtTY CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE NA I l NA l li Is 8l l9 Z l @ l Zl@l 7 to 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION li l 71 1010 l 01@l Z l@l NA -

. 1 PERSONNEt mu' dies NUVBER DESCRIPTION l

$ li ta 8l 910 l 010 l@l12 7 11 NA 80 LOSS OF OR DAMAGE TO PACILITY TYPE D ESCRIPTION NA l li l 918 9I Z l@lto 80 7

ISSUE DE CRIPTION 12 l o f L(Lj@l NA l l1IIIIII!IIIl1 7 8 9 10 68 69 80 3 NAME OF PREPARER

• 8 PHONE: (3011269-4742 {

1 LER NO. 80-22/1T j DOCKET NO. 50-317 EVENT DATE 04/15/80 REPORT DATE 04/25/80 l ATTACHMENT

.! EVENT DESCRIPTION AND PROBABLE C0 S'E0VENCES:

Mr. Monte Conner of the Division of Project Management infonned Baltimore Gas & Electric by telephone on April 15, 1980, of a possible generic deficiency in FSAR Safety Analysis Section 14.3 (Boron Dilution Incident) which may apply to Calvert Cliffs Units 1 & 2 (Docket Nos. 50-317,50-318),

T.S. 6.9.1.8.h. The baron dilution incident analysis does not analyze for the case when the Reactor Coolant System may be drained to the middle of the hot leg with a 1% shutdown margin. This condition may. occur while per-fonning maintenance on the Reactor Coolant System at a time when the reactor is not in a refueling mode.

CAUSE DESCRIPTION AND CORRECTIVE ACT70NS:

Baltimore Gas & Electric has detennined that the above condition has not been analyzed and that a 1% shutdown mi.rgin while operating in the above condition may not provide a sufficient nargin of safety; therefore, operating procedures have been changed to require a minimum of a 2% shutdown margin or insure all sources of nonborated water are restricted to a flow rate of equal to or less than 88 gpm which will 3rovide an adequate safety margin.

In addition, a Technical Specification anendment has been applied for T.S.

3.1.1.3 (shutdown margin < 2000F) to require a shutdown margin of 1 2% a k/k or sources of nonborated water shall be < 88 gpm when the RCS volume is less than 9600 ft3 .

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