ML20084L500

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Proposed Tech Specs,Allowing TS 3/4.6.2.2, Drywell Bypass Leakage, Tests to Be Performed at Intervals as Long as Five Yrs Based on Demonstrated Performance of Drywell Structure
ML20084L500
Person / Time
Site: River Bend Entergy icon.png
Issue date: 05/30/1995
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20084L477 List:
References
NUDOCS 9506070228
Download: ML20084L500 (12)
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Text

'

Attochment 3 ,

f PROPOSED CURRENT TECHNICAL SPECIFICATION CHANGES (MARK-UPS & REVISIONS) 9506070229 950530 PDR ADOCK 05000458 P PDR

CONTAI N NT SYSTEMS PECEIVEC ,3 DRWELL BYPASS LEAKAGE # I 4 I99I LIMITING CONDITION FOR OPERATION 6CC 3.6.2.2 Orvwell bypus leakage shall de less thanxennal to 10% of the acceptable A/]k design value of 1.0 fta, APPLICA81LITY: When ORWELL INTEGRITY is required per Specification 3.6.2.1.

ACTION:

With the drywell8 bypass leakage greater than 105 of the acceptable A/4 design value of 1.0 ft , restore the drywell bypass leakage to within the limit prior to incre,asing reactor coolant system temperature above 200*F.

i SURVEILLANCE REQUIREMENTS

, ~.

f year,s 4.6.2.2 At least once per the drywell bypass leakage rate test shall be conducted at an in tial erential pressure of 3.0 psid and the A/4 shall be calculated from the measured leakage. Gne drywell air lock door shall remain open during the drywell leakage test such that each drywell door is leak tested during at least every other leakage rate test.

a. If any drywell bypass leakage test fails to meet the specified limit,

_ thef::h:t!: f:7. :d ;;_;i.; i.uts shall os rn i. .J ei,. .yy. ...J by j

= 0 ziesion. If two consecutive to s fail to meet the limit, a j test shall be performed at least eve until two consecutive l

tests meet the limit, at which time le n r.tr test schedule may l

be resumed. (ye,v-i 18 wine f em lt fat./

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l RIVER BEND - UNIT 1 3/4 6-19 Amendment No. 4,'

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i CONTA!fe8ENT SYSTEMS RECEIVEC DRYWELL BYPASS LEAKAGE # I 4 1991  ;

LIMITING CONDITION FOR OPERATION 3CC 3.6.2.2 Drywell bypass leakage shall be less than or roual to 105 of the acceptable A//k oesign value of 1.0 ft8 -

APPLICA8ILITY:

When ORWELL INTEGRITY is required per Specification 3.6.2.1.

ACTION:

I With the drywell8 bypass leakage greater than 105 of the acceptable A/4 design value of 1.0 ft , restore the drywell bypass leakage to within the limit prior to increasing reactor coolant systes temperature above 200*F.

SURVEILLANCE REQUIREMENTS l

4.6.2.2 At least once per 5 years the drywell bypass leakage rate test shall be conducted at an initial differential pressure of 3.0 psid and the A//E shall be calculated from the sessured leakage. One drywell air lock door shall remain open during the drywell leakage test such that each drywell door is leak tested during at least every other lea uge rate test. l a.

If any drywell bypass leakage test fails to meet the specified limit,  ;

the frequency shall be increased to at least once per 36 months, if the subsequent test i

meets the limit, the 5 year test schedule may be resumed. If two consecutive tests fail to  !

meet the limit, a test shall be performed at least every 18 months until two consecutive i

test meet the limit, at which time the 5 year test schedule may be resumed. '

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l RIVER BEND - UNIT 1 3/4 6-19 Amendment No. 4.'

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b Attachment 4 i

l 1

PROPOSED IMPROVED STANDARD TECHNICAL SPECIFICATION CHANGES (MARK-UPS & REVISIONS) i l

1 l

l 1

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Drycell  !

B 3.6.5.1  ;

BASES i SURVEILLANCE SR 3.6.5.1.3 REQUIREMENTS -

(continued) The analyses in Reference 1 are based on a maximum drywell bypass leakage. This Surveillance ensures that the actual l drywell bypass leakage is less than or equal to the acceptable AA / li design value of 1.0 ft' assumed in the safety analysis. As left drywell bypass leakage, prior to the first startup after performing a required drywell bypass ,

leakage test, is required to be s 10% of the drywell bypass leakage limit. At all other times between required drywell leakage rate tests, the acceptance criteria is based on design AM. At the design A/Vli the containment p temperature and pressurization response are bounded by the

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pe form ng

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'T6s , r s of high radiation exposure, and i

the remote possibility that a component failure that is not w@c- identified b some other drywell or primary containment SR might_o u cc5ch r_: u: D)3rltlafli4:ri':n?:7. 5 S f.peifsf th: $;.f:::Ej;>

,w serc tu ~ eel!y p::: the trv:il1;;;; when

%WS r+k c--~ q y. _T W 1the Frequency was t

conclude'dWacce;ptable from a reliability standpoint.

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i SR 3.6.5.1.4 i The exposed accessible drywell interior and exterior ,

surfaces are inspected to ensure there are no apparent physical defects that would prevent the drywell from >

performing its intended function. This SR ensures that  !

drywell structural integrity is maintained. The Frequency was chosen so that the interior and exterior surfaces of the drywell can be inspected in conjunction with the inspections of the primary containment required by 10 CFR 50, Appendix J (Ref. 2). Due to the passive nature of the drywell structure, the specified Frequency is sufficient to identify i component degradation that may affect drywell structural i integrity.

REFERENCES 1. USAR, Chapter 6 and Chapter 15. l i

RIVER BEND B 3.6-120 Draft A

une em - '

4

. . Attachment 4 9

INSERT B1.

This Surveillance is performed at least once every 5 years.

If during the performance of this required Surveillance the drywell bypass leakage rate is > 10% of the drywell bypass leakage limit the Surveilience Frequency is increased to every 36 months. If during the performance of the subsequent consecutive Surveillance the drywell bypass leakage rate is s 10% of the drywell bypass leakage limit the 5 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 Sutveillance Frequency is increased to at least once every 18 months. The it 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 5 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, l

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. . BASES B 3.6.5.1 I i

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SURVEILLANCE SR 3.6.5.1.3 REQUIREMENTS (continued)

The analyses cypass leakage.in Reference 1 are based on a maximum drywell i drywell bypass leakageThis Surveillance is less thanensures or equalthat the actual to the acceptable A M design value of 1.0 ft 8 safety analysis. As left drywell bypass assumed in the leakage, prior to the first startup after performing a required drywell bypass leakage test, leakage limit. is At required to be s 10% of the drywell bypass i all other times between required drywell leakage rate tests, the acceptanc criteria is based on design A M . At the design A the containment

temperature and pressurization response are bounded by the assumptions of the safety analysis. The leakage test is l performed.

on a perfonnance based frequency, consistent with the difficulty of performing the test, risk of high radiation exposure, and the remote possibility that a component failure that is not identified by some other drywell or primary containment SR might occur. This Surveillance is performed at least once every 5 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 performance of the subsequent consecutive Surveillance the drywell bypass leakage rate is s 10% of the drywell bypass leakage limit the 5 year Frequency may be resumed. If durin the 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 I8 months. The 18 month Frequency is maintained until during the performance of two consecutive Surveillances the drywell bypass leakage rate is 510% of the drywell bypass leakage limit, at which time the 5 year Frequency may be resumed. For two Surveillances to be considered consecutive the Surveillances must be performed at least 12 months apart. The Frequency was concluded to be acceptable from a reliability standpoint since the frequency is performance based.

SR 3.6.5.1.4 The exposed accessibis drywell interior and exterior surfaces are inspected to ensure there are no apparent physical defects that would prevent the drywell from t performing its intended function. This SR ensures that drywell structural integrity is maintained. The Frequency was chosen so that the interior and exterior surfaces of the drywell can be inspected in conjunction with the inspections l of the primary containment required by 10 CFR 50, Appendix J (Ref. 2). Due to the passive nature of the drywell structure, the specified Frequency is sufficient to identify j component degradation that may affect drywell structural l integrity.

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l REFERENCES 1. USAR, Chapter 6 and Chapter 15.

I RIVER BEND 8 3.6__120 _ _______ _ ______ _ __ ____ __ ___ _ __O r a f t_ A ___

Drywell 3.6.E.1 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY

( SR 3.6.5.1.3 Verify bypass leakage is less than or i f40 mv .th l equal to the bypass leakage limit. '^* m L

However, during the first unit startup following bypass leakage testing l

performed in accordance with this SR, the I acceptance criterion is s 10% of the drywell bypass leakage limit.

SR 3.6.5.1.4 Visually inspect the exposed accessible Once prior to interior and exterior surfaces of the performance of drywell. each Type A ,

test required by SR 3.6.1.1.1 I

RIVER BEND 3.6-61 Draft A

'... Acccensent 4 INSERT 1 18 months following 2 consecutive tests with bypass leakage

> 10% of the bypass leakage limic until 2 consecutive l tests are s 10%

of the bypass leakage limit ARE2 36 months following a 1 test with {

bypass leakage {

> 10% of the l bypass leakage limit ARE2

- 5 years l

l 4

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.. Drywell 3.6.5.1 SURVEILLANCE REOUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3,5.5.1.3 18 months Verify bypass leakage is less than or following 2 equal to the bypass leakage limit. consecutive Mowever, during the first unit startup C#8E8 "iCh following bypass leakage testing bypass leakage performed in accordance with this SR, the a 10 of the acceptance criterion is s 10% of the DW8 l' " 9' drywell bypass leakage limit. l

, g ,

tests are 4 10%

of the bypass leakage limit M

36 months following a test with bypass leakage

> 10% of the bypass leakage limit M

5 years SR 3.6.5.1.4 Visually inspect the exposed accessible Once prior to interior and exterior surfaces of the performance of drywell. each Type A test required by SR 3.6.1.1.1 RIVER BEND 3.6-61 Oraft A

Attachment 5 DRYWELL BYPASS LEAK RATE TEST COSTS (TYPICAL)

Amount Sub-Total Amount Equipment $25,000 $25,000 Compressors (2)

Air Dryer (2)

After Coolers (2)

Manifold (1)

Hoses (vary)

Mechanic Estimated Man-Hrs ($50/hr) 1/ 275 $13,750 Test Director / Test (Man /Hr x Rate =)

l Eng/ Tech Procedure Review Tagging Hook-ups Actual Test Walk-Downs Test Review / Approval Critical Path Time 2/ 24 $432,000

($18,000/HR)

Person Rem 3/ Not included 1 person rem x $15,000 TOTAL -1 DBLRT $470,750 t

TOTAL * $6,590,500 (14 DBLRTs)

NOTES:

  • Total of 14 1/ including Contract labor DBLRTs eliminated 2/ not available at this time over remaining 3/ replacement power costs licensed life of the plant (30 years) t___ _.__ . . _ _ _ _ . _ _ . . _ _ _ _ . _ _ _ _ _ _ _ _ _ . _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Attachment 6 ,

PREVIOUS RESULTS OF RBS DRYWELL BYPASS LEAKAGE RATE TESTS t

TEST DATE RATIO TO DESIGN LIMIT CALCULATED A/Yk 2

04/85 1.4% 0.01400 ft (PREOP) 2 j 12/87 1.5 % 0.01500 ft (RF-01 )

2 ;

5/89 0.025 % 0.00025 ft (RF02) 2 11/90 0.861 % .00861 ft i

(RF03) 08/92 1.88 % 0.01880 ft 2 l

l (RF04)  !

2 06/94 1.05 % 0.01050 ft l

(RF05) l l

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1 W-- ~ ,.

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