ML20076G272

Proposed Tech Specs,Allowing Drywell Bypass Leakage Test to Be Performed at five-yr Interval

ML20076G272
Person / Time
Site:	Clinton
Issue date:	10/14/1994
From:	ILLINOIS POWER CO.
To:
Shared Package
ML20076G261	List: ML20076G272 U-602355, Revises 940812 Application for Amend to License NPF-62, Revising TS 3/4.6.2.2, Drywell Bypass Leakage, to Incorporate NRC Recommendation of five-yr Drywell Bypass Leakage Test (Dblrt) Instead of 10-yr Dblrt
References
NUDOCS 9410190215
Download: ML20076G272 (6)

Text

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to U-602355

- (LS-94-006)

Page 1 of 1 CONTAINMENT SYSTEMS l

DRYWELL BYPASS LEAKAGE LIMITING CONDITION FOR OPERATION 3.6.2.2 Drywell bypass leakage shall be less than or equal to 0% of the-minimumacceptableA//Edesignvalueof1.18ft, 2

APPLICABILITY: When DRYWELL INTEGRITY is re-luired per Specification 3.6.2.1.

ACTION:

With the drywell bypass leakage greater than 10% of the minimum acceptable A//E design value of 1.18 ft, restore the drywell bypass leakage to within 2

the limit prior to increasing reactor coolant system temperature above 200 F.

SURVEILLANCE REQUIREMENTS 5 ears 4.6.2.2 The drywell byoass leakage rate test shall be conducted at least once Y

perAl^ ;.;.tt.; er durim :::t r:f;:lin; : t:;;#at an initial differential pressure

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of3.0psiandtheA//Nshallbecalculatedfromthemeasuredleakage. One dry-well air 1ock door shall remain open during the drywell leakage test such that I

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each drywell door is leak tested during at least every otner leakage rate test.

^If any drywell bypass leakage test fails to meet the specified limit, the __... -

g dul; f:r ;;b::;;:nt i::t: ' h:l' 5: ::;E.::d ;d !?prr':d by the Ca--4rr'r

• If two consecutive tests fail to meet the limit, a test shall be performed at least everykeVmonths until two consecutive tests meet the limit, at which time the

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me::tQtestschedulemayberesumed.

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freguancy Shall be increasecl do d least once per 36 menihs; if iht subsequent fest meets the limit, de above 5 year schedule may l

be resumed.

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(LS-94-006) Page 1 of 5 ;

LbnQ t<tD40b6 Drywell Se y &f'$f2 % 76 3.6.5.1 V

r 3.6 CONTAlttMENT SYSTEMS A achmen '

20 3.6.5.1 Drywell

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,e 1 of 5 LC0 3.6.5.1 The drywell shall be OPERABLE.

i APPLICABILITY:

H0 DES 1, 2, and 3.

f ACTIONS i

CONDITION REQUIRED ACTION COMPLETION TIME i

l A.

Drywell inoperable.

A.1 Restore drywell to 1 bour OPERABLE statu::,

1 8.

Required Action and 8.1 Be in H00E 3.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> associated Completion Time not met.

AND I

8.2 '

Be in H00E 4.

36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> j

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY h SR 3.6.5.1.1 Verify bypass leakage is 10 of the

{!Ldr,ths --

bypass leakage limit.

INSERT 59A,

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A SR - 3.6.5.1.2 Visually inspect the exposed accessible de/.T,or,ths interior and exterior surfaces of the lonce pcter %

drywell.

!pe<4,< p ree of dach T he 6 test 5R 3.4.1.1.Ih 3

reqviced 1WR/6 STS-3.6-54 Rev.

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~ INSERT 54A 1

18 months following'2 consecutive tests with bypass leakage

> 10% of the bypass. leakage limit until 2 consecutive tests are s lot.

of the bypass leakage limit M

36 months.

following a test with bypass leakage:

> 10% of the bypass leakage i

limit

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(LS-94-006) Page 3 of 5

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B3 5.1 BASES ACTIONS A.1 (continued) commensurate with the importance of maintaining the drywell OPEPABLE during MODES 1, 2, and 3.

This time period also ensures that the probability of an accident (requiring drywell OPERABILITY) occurring during periods when the drywell is inoperable is minimal. Also, the Completion Time is the same as that applied to inoperability of the primary containment in LCO 3.6.1.1, " Primary Containment."

B.1 and 8.2 If the drywell cannot be restored to OPERABLE status within the required Completion Time, the plant must be brought to a MODE in which the LCD does not apply. To. achieve this status, the plant must be' brought to at least MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and to HODE 4 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full j

power conditions in an orderly manner and without challenging plant systems.

SURVE!LLANCE SR 3.6.5.1.1 REQUIREMENTS 1

'Cl The analyses in Reference f are based on a maximum drywell bypass leakage. This Surveillance ensures that the actual Q %

es_wellJypan__laa ry e is oftoftheacceptableA/d 8

ign value of {

ft sumed in the safety alysis.

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'j The leakace test is perfonneeri T.r consistent I

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with the difficulty of perfonning tS test risk of high b

radiation exposure, and the remote possibility 'that a FW M a9 component failure that is not identified by some other

'y drywell or arimary containment SR might occur.1 oper ting ]

geeg exper ence las

>wn t the e

nents ually ass t l

Su eill ce n oe rmed th 18Mno th Fr uency.

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WNb T eref c, the Fre uency was concl'uded to be acceptable from a reliability stan point.

SR 3.6.5.1.2 The exposed accessible drywell interior and exterior surfaces are inspected to ensure there are no apparent (continued)

-BWR/FSTS-B 3.6-110 Rev.

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(LS-94-006) Page 4'of 5 J

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1 INSERT B110A This Surveillance is perfonned at least once every M years.

l If during the performance of this required Surveillance the drywell bypass leakage rate is > 10% of the drywell bypass leakage limit the Surveillance Frequency is increased to every 36 months.

If during the performance of the 5

subsequent consecutive Surveillance the drywell bypass leakage rate is s 10% of the drywell bypass leakage limit the % #-year Frequency may be resumed.

If during the l

performance of two consecutive Surveillances the drywell bypass leakage is > 10% of the drywell bypass leakage limit the Surveillance Frequency is increased to at least once

~

every 18 months.

The 18-month Frequency is' maintained until j

during the performance of two consecutive Surveillances the drywell bypass leakage rate is s 10% of the drywell bypass leakage limit, at which time the 4#-year Frequency may be l

resumed.

For two Surveillances to be considered consecutive the Surveillances n:ust be performed t least 12' months apart.

c Since the Frequency is perfonnance based, 2

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SURVEILLANCE SR 3.6.5.1.2 (continued)

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REQUIREMENTS physical defects that would prevent the drywell from wiSh g)vnWoneingthbns$1 t h Con' perfonning its intended function. This SR ensures that

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drywell structural integrity is main:ained. Thei?07s..C. l

. och Frecuency was chosen so that the int"rior and exterior coWinbwghvine8 _ surfaces of the drywell can be inspected #t :=rj ett.e;-

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orftege. Due to the passive nature of the drywell bi @ G2 g

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structure, the T00]"=ntF-Frequency 1.; sufficient to s

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( 6 '(Ref. 2,).

identify component degrakion that may affect drywell i

structural integrity.

AR,Chapteri6[andChapter 15[

REFERENCES 1.

2.

IOCFR. % beper8.4 1 l

s i

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BWR/4 STS ---

. B 3.6-111 Rev.

O, nc /?n /92-

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