Text

Proposed Tech Specs Modifying Testing Frequencies for Drywell Test & Airlock Tests
	ML20059A487
Person / Time
Site:	Grand Gulf
Issue date:	10/22/1993
From:	; ENTERGY OPERATIONS, INC.
To:	;
Shared Package
ML20059A485	List: ML20059A480; ML20059A487;
References
	GNRO-93-00122, GNRO-93-122, NUDOCS 9310260344
	Download: ML20059A487 (16)
	v • d • e

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Attachment 3 GNRO-93/00122

^

Page 1 of 8 :

i PCOL-93/13 f

DRYWELL BYPASS AND DRYWELL AIRLOCK TESTING !

MARK-UP OF AFFECTED TECHNICAL SPECIFICATIONS l 4

4 l

9310260344 931022 4

~

PDR ADOCK 05000416 P

PDR 4 l

l DEFINIT 10NS Attachment 3 GNRO-93/00122 l Page 2 of 8 DRYWELL INTEGRITY '

1.10 DRYWELL INTEGRITY shall exist when:

a.

All drywell penetrations required to be closed during accident conditions are either: ;

1. Capable of being closed by an OPERABLE drywell automatic isolation system, or :

2. Closed by at least one manual valve, blind flange, or deactivated automatic valve secured in its closed position, except for valves that are opened under administrative controls as permitted by Specification 3.6.4.

b. The drywell equipment hatch is closed and sealed.

c. The drywell airlock is in compliance with the requirements of Specification 3.6.2.3. -

d. The drywe 1 1 a e rates are within the limits of Specification

-2.5.2.2< .6 2..). I

e. The suppress d is in compliance with the requirements of Specification 3.6.3.1. J f.

The sealing mechanism associated with each drywell penetration; e.g., welds, bellows or 0-rings, is OPERABLE.

I l

l l

l I

l GRAND GULF-UNIT 1 1-2a Amendment No.4M - l

Attachment 3 GNRO-93/00122 CONTAINMENT SYSTEMS Page 3 of 8 3/4.5.2 DRYWELL i DRYWELL INTEGRITY LIMITING CONDITION FOR OPERATION 3.6.2.1 DRYWELL INTEGRITY shall be maintained.

P APPLICABILITY: OPERATIONAL CONDITIONS 1, 2L*>and 3.

l ACTION:

Without DRYWELL INTEGRITY, restore DRYWELL INTEGRITY within I hour or be in at least HOT following 24 SHUTDOWN hours. within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within SURVEILLANCE REOUIREMENTS 4.6.2.1 DRYWELL INTEGRITY shall be demonstrated:

a.

At least once per 31 days by verifying that all drywell penetra-tions** not capable of being closed by OPERABLE drywell automatic isolation valves and required to be closed during accident conditions are closed by valves, blind fit.nges, or deactivated automatic valves secured in position, except for valves that are opened under administrative control as permitted by Specification 3.6.4.

b. By verifying the drywell air lock is in compliance with the requirements of Specification 3.6.2.3.

c. By verifying the suppression pool is in compliance with the

d. By verifying drywell bypass leakage is less than or equal to 10% of the bypass leakage limit at least once per 10 years. If any drywell bypass leakage rate test fails to meet the specified limit, the test frequency shall be increased to 36 months; if the subsequent consecutive test meets the limit, the above ten year test schedule may be resumed. If two consecutive tests fail to meet the limit, a test shall be performed at least once every 18 months until two consecutive tests meet the limit, at which time the above test schedule may be resumed.

_v

Scc Spccid Tcst Occptica 3.10.1.L

- Except valves, blind flanges, and deactivated automatic valves which are located inside the drywell or containment and are locked, sealed or otherwise secured in the closed position. These penetrations shall be verified closed during each COLD SHUTDOWN except such verification need not be performed more often than once per 92 days. .

GRAND GULF-UNIT 1 3/4 6-13 Amendment No. E 402

Attachrnent 3

~ GNRO-93/00122 Page 4 of 8 CONTAINMENT SYSTEMS DRYWELL BYPASS LEAKAGE LIMITING CONDITION FOR OPERATION Mc.ke u-3.6.2.2 *0r7.:J? bypass-leekege-shall be lese then er aquei 1: 10% f-theo -

-ettept:51: */JE design v:!ue of 0.90 ft 2A .

-AF AMC4BI LITY. L' hen-ORYWEM:-ENTEGRETY is required per Spee+f4eetien 3.5.2.1.1-

-ACT40 Q

-With the cry.<cil bypest-leekage greatee-than-10% of th: ::ceptab1: */[tcc:ign t

--value of 0. 90 f2t , restore-the-drywel' bypes: 10:k:ge t: witki- the 'imit '2.

3

- prior to incre ing re::ter :: 1:nt :ystem t::p:ratur: :bev: 200 " t

- SURVEILLANCE REQUIREMENTS b

Y-

_ ,)

4. 6.2.2 -The-drywell-bypass-leakage-rate-test-shall-be-conducted at le St.cnce 't

-per-.18-months-at :n initial different4*l-pressure of 3.0 p;id :nd th: ^//h ':

-sha 14-be-calcu la t ed-f+om-the-se a sveed-leek age. 0 ^.: d ryer " - i ' " d ^ ^ * 'h* o ranin-open-during-the-drywel+-leakege-test-strehd*at esch dry.;:l' deer !! leak 1

-tested-dur4r,9-at-4 east-every-other cry.;:11 1:ekage r:1+-testr-

-a . If :ny d f.;;1' bypass-leakage-rate-test-f4445-to-meet the :peci'ied t

-14mitr-the-test-schedule-for-subrepuent tests shel1 be -edewad ad as

-approved-by-the-Gemmission. If tve-eentecwtive tests-feil tc . meet ^u.

= tn; tirit, a test-shell be perfcraed st-4eest ence every ^ s,enth; t i enti' t=0 censecutive-tests-meet-the-14mit, :t dich-t4:: the abeve c te:t :chedul: may-be-re:= ed.-c.

b. air-locks-sha44-be-tested :nd dezen:trated-CP4AABLE p:r Survei!!:n : c 4etttirement 4.5.2.3. -0

-c. The prov4540ns-of- Spec 4f4 cat 4:n *.0.2 :re not :pplic:ble. t GRAND GULF- '1 3/4 6-14 Amlwed o. _

CONTAINMENT SYSTEMS Attachment 3 GNRO-93/00122 DRYWELL AIR LOCK Page 5 of 8 LIMITING CONDITION FOR OPERATION 3.6.2.3 The drywell air /Tock shall be OPERABL *tt M ,

c.

Both decri closad except ' hen the ei- 10ck i; being u;cd for ncrmc! trans entry-and--exit

-be-closed, endtthrough the dry"cll, then-at-4 east-one air icck deer indi'rt

b. in over-all-air-4oc4-leakage rate of 1000 than et et Pa , 11.5 p;ig.A qual tc 2 sef per hcm L -

APPLICABILITY: OPERATIONAL CONDITIONS 1, '* and 3.

ACTION: ,

m 6d tA ;

a. ,

Withonedrywellairflockdoorinoperabl( mdA .

-1.

Mainta4n-at

-the in0per:ble ci-les:t the to

!cck door OPBARLE OPERABLE-ai- !cck Status dooe-cleted and eit

'ithia

-leck the OPEPABLE air leck deer !c::d. Operat4en may24 50er: Or b then esntihue -L-i

-provided-that-the-@ERABLE air !cck-dcer i ^;crified te be 10 kedh

-c, o.hred ,vn~ m, at least--ent um u_

per 31-day:.

__m ,, m __ Othe r.ci:0, b: ir at 100:t 90T e

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--f0!!ceing 24 heure. u 4 44 bV6W .bilV I 'a/V MIT W 5 bd3515 bliC'

b. uit3 t3e 37ymey, 35 7ee v i 4,gpe73373, exg,pg 33 3 7 egg 7t gy 37 4,gpg7333

-ai- lock dece, :34atair at least one ai- lock deer c!csed; *estere thet i

j noperable aia lock te OPEPABLE status eithia 24 keur: ,

at le :t-L '

=iiOT

'0!! wing SWTBOWN-within-the-next-42-hours--and4n-40LD4H9T00*

24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . the -t withi!

-c. With en d rye:11-a te-lock-doop-inf4atable-seal-system-sea 4-pr e s : u r e

-4ns-trumentation channsi- inopacable, restere the inoperable chennal s tot

-GPERABLE-status-within-7-days-oe-vee 44y-the-essoc4ated-inf4atable :::1 a

--pressure-to4s 160 prig -at least once par-12 hours a._

I 1

T 3 50: Special Test Excepticn 3.10.1.L i

GRAND GULF-UNIT 1 3/4 6-15 Amendment No. O

Attachment 3

- GNRO-93/00122 CONTAINMENT SYSTEMS Page 6 of B SURVEILLANCE REQUIREMENTS 4.6.2.3 ellairjiockshallbedemonstratedOPERABLE:

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b. Byconductinganoverallairffockleakagetesta , 11.5 psig and veri ing that the overall air ock leakage ra e is dthi- '.t;^_

~liai t " ^ 6 2. sc.idicist one_a pc.r- le rno .

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the .ir icck "

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~-= 's ~y,--- su g QQ i c.

At least once per 18 months by verifying that only one door in the g airflock can be opened at a time. I l

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.g.,_._, ..sn r.w.,n. __.. ....,.,,o GRAND GULF-UNIT 1 3/4 6-16 Amendment No. (

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Attachment 3 GNRO-93/00122 Page 7 of 8 o

TS 3/4.6.2.3 Insert A l 7

NOTES

1. Entry and exit is permissible to perform repairs of the affected airlock components.

2. Required ACTION a is not applicable if both doors in the airlock are inoperable and I j

ACTION c or d is entered.

t

3. Entry and exit is permissible for 7 days under administrative controls. '

I

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l TS 3/4.6.2.3 insert B y l

, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , venfy the OPERABLE door is closed, and within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months lock the OPERABLE door closed. Operation may continue provided that the OPERABLE door is )

verified by administrative means to be locked closed at least once per 31 days. Otherwise, enter I ACTICN d. '

NOTES

1. Required ACTION b is not applicable if both doors of the airlock are inoperable and ACTION c or d is entered. )

2. Entry and exit is permissible under the control of a dedicated individual.

b. With the drywell airlock interlock mechanism inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , verify an OPERABLE door is closed, aM within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months lock an OPERABLE door closed. Operation may continue provided that an OPERABLE door is verified by administrative means to be locked closed at least once per 31 days.

Otherwise, enter ACTION d.

c. With the drywell airiock inoperable for reasons other than ACTIONS a or b, immediately initiate action to evaluate drywell overall leakage rate per LCO 3.6.2.1, "Drywell Integrity," using current airlock test results, and within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , verify a door is closed, ag restore airlock to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . Otherwise, enter ACTION d.

d. With the required ACTIONS a. b, or c (including the associated completion times) not met, be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

TS 3/4.6.2.3 Insert C 7

NOTE Only required to be performed upon entry into drywell.

~

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l Attachment 3 -

i

GNRO-93/00122 CONTAINHENT SYSTEMS BASES l I

l CONTAINMENT PURGE SYSTEM (Continued)

Leakage integrity tests with a maximum allowable leakage rate for purge supply and exhaust isolation valves will provide early indication of resilient material seal degradation and will allow the opportunity for repair before i gross leakage failures develop. The 0.60 L, leaking limit shall not be exceeded when the leakage rates determined by the leakage integrity tests of I these valves are added to the previously detemined total for all valves and penetrations subject to Type B and C tests. ;

3/4.6.2 DRWELL 3/4.6.2.1 ORYWELL INTEGRITY i i

Drywell integrity ensures that the steam released for the full spectrum )

l of drywell pipe breaks is condensed inside the primary containment either by the suppression pool or by containment spray. By utilizing the suppression i pool as a heat sink, energy released to the containment is minimized and the '

severity of the transient is reduced.

3/4.6.2.2 DRWELL BYPASS LEAKAGE !

The limitation on drywell bypass leakage rate ensures that the maximum leakage which could bypass the suppression pool during an accident would not result in the l containment exceeding its design pressure of 15.0 psig. The design drywell ;

l leakage. rate is expressed a A/5 and has a value of 0.90 ft2 A/ 4 is cependent l only on the geometr of drywell leakage paths where A = flow area of leakage paths in ft2 and ,K is a lumped constant which considers geometric and friction loss coefficients such as discontinuities and Reynolds number. At a 3 psid differential pressure from drywell to containment an A/8 of 0.90 ft2 has an equivalent mass flow of 35,000 scfm. The integrated drywell leakage value is 1 limited to 10% of the allowable drywell leakage capability, which is equivalent to 3500 scfm at 3 psid drywell to containment.

l The A/8 value of 0.90 ft is derived from the analysis of " bypass capability with containment spray and heat sinks" (FSAR 6.2.1.1.5.5). The limiting case accident is a very small reactor coolant system break which will not automatically result in a reactor depressurization. The long term differen-tial pressure created between the drywell and containment will result in a signi-ficant pressure buildup in the containment due to this bypass leakage.

3/4.6.2.3 DRWELL AIR LOCK The limitations on closure for the drywell air lock are required to meet f the restrictions on DRWELL INTEGRITY and the drywell leakage rate given in Specifications 3.6.2.1 and 3.6.2.2. The specification makes allwances for ,

the fact that there may be long periods of time when the air lock will be in I a closed and secured position during reactor operation. Only one closed door l

in the air lock is required to maintain the integrity of the drywell. h ver"ic.tien that =h ei- un er urhubh heliyet- h eEuntt

- by the per'e-eace ef e !ocal hek-detectien test 'e" a PMd of h55 *"t

'8 hourt te pa-hsibh if it een be trnstreted that the heter ratet can be accurately ete-bed fer thh :hcrte pe-4ed. Thh h %-acewh with Secticas 6.1 end 7.6 ef AuSI k25.A-107? (

GRAND GULF-UNIT 1 B 3/4 6-3 Amendment No. tb f 1

l l

l

Attachment 4 j GNRO-93/00122 l Page 1 of 8 .

t PCOL-93/13 DRYWELL BYPASS AND DRYWELL AIRLOCK TESTING l INFORMATIONAL COPY OF PROPOSED t

TECHNICAL SPECIFICATION PAGES i

i

Attachment 4 .

GNRO-93/00122 !

Page 2 of 8 DEFINITIONS DRYWELL INTEGRITY j 1.10 DRYWELL INTEGRITY shall exist when:

a. All drywell penetrations required to be closed during accident conditions are either:

1. Capable of being closed by an OPERABLE drywell automatic isolation system, or

2. Closed by at least one manual valve, blind flange, or deactivated automatic valve secured in its closed position, except as provided in Table 3.6.4-1 cf Specification 3.6.4.

b. The drywell equipment hatch is closed and sealed.

c. The drywell airlock is in compliance with the requirements of Specification 3.6.2.3.

3

d. The drywell leakage rates are within the limits of Specification 3.6.2.1. l

e. The suppression pool is in compliance with the requirements of Specification 3.6.3.1.

~

f. The sealing mechanism associated with each drywell penetration; e.g., welds, bellows or 0-rings, is OPERABLE.

i 1

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Amendment No. l l

1

+

[.

Attachment 4 -

-. GNRO-93/00122 i Page 3 of 8 .

CONTAINMENT SYSTEMS l 3/4.6.2 DRYWELL ]

DRYWELL INTEGRITY LIMITING CONDITION FOR OPERATION 3.6.2.1 DRYWELL INTEGRITY shall be maintained.

APPLICABILITY: OPERATIONAL CONDITIONS 1,2, and 3.

l ACTION:

Without DRYWELL INTEGRITY, restore DRYWELL INTEGRITY within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or be in at least HOT I SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , i

SURVEILLANCE REQUIREMENTS 4.6.2.1 DRYWELL INTEGRITY shall be demonstrated:

a. At least once per 31 days by verifying that all drywell penetrations" not capable of :

being closed by OPERABLE drywell automatic isolation valves and required to be closed during accident conditions are closed by valves, blind flanges, or deactivated automatic valves secured in position, except for valves that are opened under >

administrative control as permitted by Specification 3.6.4.

b. By verifying the drywell airlock is in compliance with the requirements of Specification 3.6.2.3.

j

c. By verifying the suppression pool is in compliance with the requirements of Specification 3.6.3.1.

d. By verifying drywell bypass leakage is less than or equal to 10% of the bypass' leakage limit at least once per 10 years. If any drywell bypass leakage rate test fails .

to meet the specified limit, the test frequency shall be increased to once every 36 ,

months; if the subsequent consecutive test meets the limit, the above ten year test schedule may be resumed. If two consecutive tests fail to meet the limit, a test shall )

be performed at least once every 18 months until two consecutive tests meet the limit, at which time the above test schedule may be resumed. ;

l I

" Except valves, blind flanges, and deactivated automatic valves which are located inside the

~

drywell or containment and are locked, sealed or otherwise secured in the closed position. These penetrations shall be verified closed during each COLD SHUTDOWN except such verification need not be performed more often than once per 92 days.

Amendment No. l

r \

Attachment 4

- GNRO-93/00122 i

Page 4 of 8 j

CONTAINMENT SYSTEMS ,

1 DRYWELL BYPASS LEAKAGE j i

LIMITING CONDITION FOR OPERATION 3.6.2.2 deleted SURVEILLANCE REQUIREMENTS 4.6.2.2 deleted i

i i

5 r

Amendment No. l

.-- c -

="

, Attachment 4

, GNRO-93/00122 !

CONTAINMENT SYSTEM 4

DRYWELL AIRLOCK '

LIMITING CONDITION FOR OPERATION >

3.6.2.3 The drywell airlock shall be OPERABLE. i APPLICABILITY: OPERATIONAL CONDITIONS 1,2, and 3. !

l ACTION: i NOTES

1. Entry and exit is permissible to perform repairs of the affected airlock components.

2. Required ACTION a is not applicable if both doors in the airlock are inoperable -

and ACTION c or d is entered.

3. Entry and exit is permissible for 7 days under administrative controls.

i

. _ ___. i

a. With one drywell airlcck door inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , verify the OPERABLE door is closed, and within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months lock the OPERABLE door closed. Operation may continue provided that the OPERABLE door is verified by administrative means to be locked closed at least once per 31 days. Otherwise, enter ACTION d.

NOTES l

1. Required ACTION b is not applicable if both doors of the airlock are inoperable ;

and ACTION c or d is entered.

i

2. Entry and exit is permissible under the control of a dedicated individual.

I

b. With the drywell airlock interlock mechanism inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , verify an OPERABLE door is closed, and within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months lock an OPERABLE door closed.

Operation may continue provided that an OPERABLE door is verified by administrative means to be locked closed at least once per 31 days. Otherwise, enter i ACTION d.

Amendment N3 l l

i

7_

e- i

. Attachment 4 I GNRO-93/00122 i Page 6 of 8 ;

c. With the drywell airlock inoperable for reasons other than ACTIONS a or b, immediately initiate action to evaluate drywell overall leakage rate per LCO 3.6.2.1, l "Drywell Integrity," using current airlock test results, and within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , verify a door is i closed, and restore airlock to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . Otherwise, enter i ACTION d. t

d. With the required ACTIONS a, b, or c (including the associated completion times) not met, be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . ;

f i

I t

T i

4 il l

l i

j l i 1 ;

Amendment No. j

a q*

. Attachment 4

, GNRO-93/00122 i Page 7 of 8 CONTAINMENT SYSTEMS l

SURVEILLANCE REQUIREMENTS 4.6.2.3 The drywell airlock shall be demonstrated OPERABLE:

a. deleted

b. By conducting an overall airlock leakage test at 2 11.5 psig and verifying that the overall airlock leakage rate is 5; 2 scfh at least once per 18 months.

NOTE Only required to be performed upon entry into drywell.

c. At least once per 18 months by verifying that only one door in the airlock can be opened at a time.

d. deleted l

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l l

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Amendment No. l J

o

< Attachment 4

, GNRO-93/00122 Page 8 of 8 CONTAINMENT SYSTEMS BASES 3/4.6 2 DRYWELL 3/4.6 2.1 DRYWELL INTEGRITY Drywell integrity ensures that the steam released for the full spectrum of drywell pipe breaks is condensed inside the primary containment either by the suppression pool or by containment spray By utilizing the suppression pool as a heat sink, energy released to the containment is minimized and the severity of the transient is reduced.

3/4.6.2.2 DRYWELL BYPASS LEAKAGE The limitation on dryweli bypass leakage rate ensures that the maximum leakage which could bypass the suppression pool during an accident would not result in the containment exceeding its design pressure of 15.0 psig. The design drywell leakage rate is expressed a A/ W and has a value of 0.90 ft2 . Al K is dependent only on the geometry of drywell leakage paths where A = flow area of leakage paths in ft2 and k is a lumped constant which considers geometric and friction loss coefficients such as discontinuities and Reynolds number. At a 3 psid differential pressure from drywell to containment an Al E of 0.90 ft2has an equivalent mass flow of 35,000 scfm. The integrated drywell leakage value is limited to 10% of the allowable drywell leakage capability, which is equivalent to 3500 scfm at 3 psid drywell to containment.

The A/ E value of 0.90 ft is2derived from the analysis of " bypass capability with containment spray and heat sinks"(UFSAR 6.2.1.1.5.5). The limiting case accident is a very small reactor coolant system break which will not automatically result in a reactor depressurization. The long term differential pressure created between the drywell and containment will result in a significant pressure buildup in the containment due to this bypass leakage.

3/4.6.2.3 DRYWELL AIR LOCK The limitations on closure for the drywell airlock are required to meet the restrictions on DRYWELL INTEGRITY and the drywell leakage rate given in Specifications 3.6.2.1 and 3.6.2.2. The specification makes allowances for the fact that there may be long periods of time when the airlock will be in a closed and secured position during reactor operation. Only one closed door in the airlock is required to maintain the integrity of the drywell.

'l Amendment No.

ML20059A487

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