ML20072E619

Proposed Tech Specs Allowing Drywell Bypass Leakage Rate Tests to Be Performed at Intervals as Long as Ten Years

ML20072E619
Person / Time
Site:	Clinton
Issue date:	08/12/1994
From:	ILLINOIS POWER CO.
To:
Shared Package
ML20072E612	List: ML20072E619 U-602320, Application for Amend to License NPF-62,proposing Changes to TS 3/4.6.2.2, Drywell Bypass Leakage, to Allow Drywell Bypass Leakage Rate Tests to Be Performed at Intervals as Long as Ten Years
References
NUDOCS 9408230020
Download: ML20072E619 (6)

Text

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Attachment 3' to U-602320

' 4 LS-94-006 l Page 1 of 1 1

l CONTAINMENT SYSTEMS ORYWELL BYPASS LEAKAGE LIMITING CONDITION FOR OPERATION 3.6.2.2 Orywell bypass leakage shall be less than or equal to.10% of the minimum acceptable A/ 8 design value of 1.18 ftz, APPLICABILITY: When DRYWELL INTEGRITY is required per Specification 3.6.2.1.

ACTION:

With the drywell bypass leakage greater than 10% of the minimum acceptable A/4 design value of 1.18 ft ,2 restore the drywell bypass leakage to within the limit prior to increasing reactor coolant system temperature above 200*F.

SURVEILLANCE REQUIREMENTS 30 p 4.6.2.2 The drywell bypass leakage rate test shall be conducted at least once l

7per10.;;nthsertrin;;;;hrefuelingcut:pataninitialdifferentialpressure of .0 psi and the A/VK shall be calculated from the measured leakage. One dry-well airlock door shall remain open during the drywell leakage test such that l each dr: Sell door is leak tested during at least every other leakage rate tes I If any drywell bypass leakage test fails to meet the specified limit, the 4de-g dele-for cub:cquent t::t: :hal14e-+ev4ewed ar.d :ppreved by the Commissiom If consecutive tests fail to meet the limit, a test shall be performed at least very months until two consecutive tests meet the limit, at which time the a C10 ;; nth- test schedule may be resumed.

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CLINTON - UNIT 1 3/4 6-15 )

l 9408230020 940812 I PDR ADOCK 05000461 j p PDR

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P rMp aff66l Drywell Se HTge J if476 3.6.5.1 3.6 CONTAINMENT SYSTEMS

']"2 0 3.6.5.1 0rywe11 LS-94-006 Page 1 of 5 LCO 3.6.5.1 The drywell shall be OPERABLE.

APPLICABILITY: MODES 1, 2, and 3.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. Orywell inoperable. A.1 Restore drywell to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> OPERABLE status.

8. Rcquired Action and 8.1 Be in MODE 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 8.2 ' Be in MODE 4. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY h SR 3.6.5.1.1 Verify bypass leakage is bypass leakage limit.

10 of the {10 der,th3-

.IN$ERT 9{A ,

h SR 3.6.5.1.2 Visually inspect the exposed accessible interior and exterior surfaces of the

[mer,ths once prtor k drywell . * ( bf ant e of och e A te<&

geqvi 4 5ft3.4.1.l.Ih

-BWR/6 W 3.6-54 Rev. O, 09728/92'

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,. Attachment 4

' to U-602320

- LS-94-006

' Page 2 of 5 INSERT 54A 18 months following 2 consecutive tests with bypass leakage

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

of the bypass leakage limit AG 36 months following a test with bypass leakage

> 10% of the bypass leakage limit AE 120 months i

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. , . Attachment 6

, to U-602320 LS-96 0 6 .;

r,=.of5 l ns 2 to 196 W 4' Drywel1 B 3.6.5.1 BASES ACTIONS A.1 (continued) comensurate with the importance of maintaining the drywell OPERABLE 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 B.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 LCO 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 MODE 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 1 experience, to reach the required plant conditions from full power conditions in an crderly manner and without challenging plant systems.

SURVEILLANCE SR 3.6.5.1,1 REQUIREMENTS 1

C1 The analyses in Reference / are based on a maximum drywell bypass leakage.

rJwilLbyp This Surveillance ensures that the actual

' \l esign value of kaeisW10f%oftheacceptableA/d g) ftbssumed in the safety 3!!alysis.

The leakace tesf. is performeC r., f - ,J . consistent 1

PdoWM M& ^k\ d with the difficulty of performing tO test. risk of high radiation exposure, and the remote possibility that a component failure that is not identified by some other estM drywell or 'y

)rimary containment SR miaht occur.J Oper ting l bN u $e w r rue te redue T efo(e - .

66RT EM- are1TaEdtystan$ point.the Fre uency was conci'uded to be acce SR 3.6.5.1.2 The exposed accessible drywell interior and exterior surfaces are inspected to ensure there are no apparent i

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.BWR/FSTS- B 3.6-110  !

Rev. 0,*09728792- l p q w q ,-~-e r,- w q -# # , --% W t~nn-^- --r--r~ w ~- *v n' 'n-~4-m*""'s * " ~ = ' ' - - - - ' - - - - - - - - - - - - - - - - - - ~ - ^

Attachment 4 to U-602320 LS-94-006

. Page 4 of 5 INSERT B110A This Surveillance is performed at least once every 10 years.

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 perfortnance of the subsequent consecutive surveillance the drywell bypass leakage rate is s 10% of the drywell bypass leakage limit If during the the 10 year Frequency may be resumed.

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 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 10 year Frequency may be resumed. For two Surveillances to be considered consecutive the Surveillances must be performed at least 12 months apart.

Since the Frequency is performance based, i

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~ P Tio ure 2 to '

q W dsN) B .1 Attachment 4

,) BASES to U-602320 ( i LS-94-006 (

Page 5 of 5 SURVEILLANCE SR 3.6.5.1.2 (continued)

REQUIREMENTS physical defects that would prevent the drywell from ih Con' performing its intended function. This SR ensures that u ith h)v ock'o ne ir15pecRens $\

drywell structural integrity is maintained. Thet0D;;.J, l oC u-<. War guency was_ chosen so that the interior and exterior con %inment hcfdry0 -re surfaces of the drywell can be inspectedAct c;;ry-ether 14ag n"+=ge. Due to the passive nature of the drywell b i WW@ / A $\ structure, w the 440P=tF Frequency is sufficient to

( 7 (Ref,2.), identify component degrakon that may affect drywell structural integrity. g RertatNCes @ I. 8l/AR,ChapterN6[andChapter O 15[

2. 10 CFR. 50, Agend.') 7. l

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BWR/6 STS . 8 3.6-111 Rev. O, 09/28/92-

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