ML20117K112

Proposed Tech Spec,Requiring Ice Condenser Doors to Remain Closed & Be Capable of Opening Automatically

ML20117K112
Person / Time
Site:	Catawba, McGuire, 05000000
Issue date:	05/07/1985
From:	DUKE POWER CO.
To:
Shared Package
ML20117K080	List: ML20117K077 ML20117K112
References
TAC-57673, TAC-57674, NUDOCS 8505150316
Download: ML20117K112 (7)

Text

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I Proposed Amendment to Catawba Unit 1 and McGuire Units 1 and Technical Specification 3.6.5.3 Concerning Ice Condenser Doors t

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JUSTIFICATION AND ANALYSIS OF SIGNIFICANT HAZARDS CONSIDERATION The proposed amendment is in response to a sommitment made during the February 8,1985 Enforcement Conference for Catawba Unit.1. The Cor.ference was in regard to the incident at. Catawba where all but one pair of lower inlet ice condenser doors were found blocked closed.

NRC/ Region II Staff determined that the applicable ACTION Statement

-in the Technical Specifications was inadequate in that it allowed the ice' condenser doors to be in a closed and inoperable condition for an inordinate amount of time when compared to their safety significance.

This proposed amendment is based upon a draft Technical Specification distributed by the Region II Staff at this Conference.

10 CFR 50.92 states that a proposed amendment involves no significant hazards considerations if operation in accordance with the proposed amendment would not:

(1) Involve a significant increase in the probability or consequences of an accident previously evaluated; or

! (2) Create the possibility of a new or different kind of I

accident from any accident previously evaluated; or (3) Involve a significant reduction in a margin of safety.

The proposed amendment does not increase the probability or consequences of an accident previously evaluated, it does not create the possibility of a new or different kind of accident and it does not involve a significant reduction in a margin of safety.

The Commission has provided guidance concerning the application of standards of no significant hazards determination by providing certain examples (48 FR 14870). One of the examples of actions likely

, to involve no significant hazards considerations is a change that l- constitutes an additional limitation, restriction or control not presently included in the Technical Specifications: for example, a more stringent surveillance requirement. This amendment request is adding an additional limitation beyond that currently contained in the Technical Specifications but does not involve reducing any safety margins.

l l Based upon the above analysis, the proposed amendments are determined to involve no significant hazard considerations. )

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CONTAINMENT SYSTEMS 1

ICE CONDENSER DOORS 1

LIMITING CONDITION FOR OPERATION 3.6.5.3 The ice condenser inlet doors, intermediate deck doors, and top deck doors shall be closed and OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

A ON:

(.bd capab d og<ng admdie l/yh 4* With one or more ice condenser doors open or otherwise inopera % POWER OPERATION may continue for up to 14 days provided the ice bed temperature is monitored at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and the maximum ice bed temperature is maintained less than or equal to 27*F; otherwise, restore the doors to their closed positions or OPERABLE status (as applicable) within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least HOT following 30 STANDBY hours. within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the

b. M ont or cert. kr condenser doet 5 iceprak (vwk c4pNe d ege aA=4fcdly\ , reslo<< d herr fo CPOAfte s%s wh i k.ar er b. in uor sTM any w;A 6 h.or. and to

1. er sguToow' wNina A 4.ang 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Andin COLD $luTboud wiNin jhw bhuinj 30 hout.r, SURVEILLANCE REQUIREMENTS 4.6.5.3.1 Inlet Doors - Ice condenser inlet doors shall be:

a. Continuously monitored and determined closed by the inlet door position monitoring system, and

b. Deracnstrated OPERABLE during shutdown at least once per 9 months by:

1) Verifying that the torque required to initially open each door is less than or equal to 675 inch pounds; l 2) Verifying thatensQ< g:. ' 4; e'penuk ukeskedQ e,ac door In lh*l is not impaired IN/

by ice, i

frost)er debris;G er e%e of,deden

3) Testing a sample of at least 50% of the doors and verifying that the torque required to open each door is less than 195 inch pounds when the door is 40 degrees open. Tnis torque is defined as the " door opening torque" and is equal to the nominal door torque plus a frictional torque component. The doors selected for determination of the " door opening torque" shall be selected to ensure that all doors are tested at least once during two test intervals; I McGUIRE - UNITS 1 and 2 3/4 6-37 l

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.c CONTAINMENT SYSTEMS BASES _.

.-3/4.6.5 ICE CONDENSER condenser. ensure that the overall system will be

, sufficient pressure suppression capability to limit the containm

. pressure transient to less than 14.8 psig during LOCA conditions.

3/4.6.5.1 ICE BE0

- will: .The OPERABILITY of the ice bed ensures that the requir (1) be distributed evenly through the containment , (2)bays contain

, LOCA. and (3)'contain sufficient heat removal c Reactor Coolant System volume released during a LOCA.

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consistent with the assumptions used in the accident analyses.These c The minimum weight figure of 1269 pounds of ice pera 10% basket c conservative 10 higher figure allowance for ice loss through sublimation which is a of than assumed for the ice condenser design.

2,466,420 allowance to account for systematic error inIn .

weighing servative the

-event that observed sublimation rates are eq be adjusted downward.

.reduction weighed each 9 months may be reduced after 3 years is supported by observed sublimation data.

'3/4.6.5.2 ICE BED TEMPERATURE MONITORING SYSTEM the capability is available for monitoring theresice that te:np

.the system is inoperable, the ACTION requirements In the event provide ass

.limits.

ice bed heat removal capacity will be retained within the specifie

_3/4.6.5.3 ICE CONDENSER DOORS be maintained closed ensures that the released Reactor ey Coo during a LOCA will be diverted through the ice condenser bays for h air

-and that excessive sublimation of the iceeatbed intrusion. removal will not

, If an Ice Condenser Door is not capable of opening autcznatically then system function is seriously degraded and inmediate action must be taken to restore the opening capability of the door. Not capable of

'is physically blocked frce opening by installation of a device.or by obstruction fra temporary or pemanent installed equipnent.

McGUIRE - UNITS 1 and 2 B 3/4 6-5 4

i.ummt,Mero a r $ 7 EMS

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ICE CONDENSER DOORS LIMITING CONDITION FOR OPERATION 3:6.5.3 The ice condenser inlet doors, intermediate deck doors, and top deck doors shall be closed and OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

, ACTION:

' (bd capabl4 of opening ade*%deMy)

4. With one or more ice condenser doors open or otherwise ino monitored at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and the maximum ice bed temperature is

maintained less than or equal to 27*F; otherwise, restore the doors to tneir

' closed positions or OPERABLE status (as applicable) within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or bes in at least HOT following STANOBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUT 00WN with 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

h. M one- or more. ics condenser cloors inopera.Me hof def E o opemn3 d mdcMy ecshre al doo,3 h cPEgAglE db JMn

1. hou.c or be. In No T STAAB8)/ wiSin lo hou.r5 ad in NOT 54MTDoWM Uth'in he hcwio3 6 heu.rs and in COLD SMITDoCA) won hehe SURVEILLANCE REQUIREMENTS mes .

4.6.5.3.1 Inlet Doors - Ice condenser inlet doors shall be:

a.

Continuously monitored and determined closed by the Inlet Door Position Mcnitoring System, and b.

Demonstrated OPERABLE during shutdown at least once per 3 months during the first year after the ice bed is initially fully-loaded and at least once per 6 months thereafter by:

1). Verifying that the torque required to initially open each door is less than or equal to 675 inch pounds; gw. .f .poa3 adm4cJy in ikd Y is

2) (Nfrost er debrig; Verifying that j

4 g '.; d each door is not impa or der obskNed184

3) Testing a sample of at least 25% of the doors and verifying that the torque required to open each door is less than 195 inch pounds when the door is 40 degrees open. This torque is defined as the " door opening torque" and is equal to the nominal door torque plus a frictional torque component. The doors selected for determination of the " door opening torque" shall be selected during to ensure four test that all doors are tested at least once intervals; CATAWBA - UNIT 1 3/4 6-36

. CONTAINMENT SYSTEMS .

BASES 3/4.6.5 ICE CONDENSER

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The requirements associated with each of the components of the' ice con-x denser ensure that the overall system will be.available to provide sufficient pressure suppression capability to limit the containment peak pressure tran-sient to less than 14.7 psig during LOCA conditions.

3/4.6.5.1 ICE BE0

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will:

The OPERABILITY of the ice bed ensures that the required ice inventory (1) be distributed evenly through the containment bays, (2) contain sufficient boron to preclude dilution of the containment sump following the LOCA, and (3) contain sufficient heat removal capability to condense the Reactor Coolant System volume released during a LOCA.

with the assumptions used in the safety analyses. These conditions are consistent The minimum weight figure of 1218 pounds of ice per basket contains a 10%

conservative allowance for ice loss through sublimation which is a' factor of 10 higher than assumed for the ice condenser design. The minimum total weight of 2,368,652 pounds of ice also contains'an additional 1% conservative allowance to account for systematic error in the weighing instruments. In the event that observed sublimation rates are equal to or lower than design predictions after 3 years of operation, the minimum ice baskets weight may be adjusted downward.

In addition, the number of ice baskets required to be weighed each 9 months may be . reduced after 3 years of operation if such a reduction is supported by observed sublimation data.

3/4.6.5.2 ICE BED TEMPERATURE MONITORING SYSTEM The OPERABILITY of the Ice Bed Temperature Monitoring System ensures that the capability is ~available for monitoring the ice temperature. In the event

' the system is inoperable, the ACTION requirements provide assurance that the ice bed heat removal capacity will be retained within the specified time limits. t 3/4.6.5.3 ICE CONDENSER DOORS -

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The OPERABILITY of the ice condenser doors and the requirement that they y$ ~ during a LOCAclosed be maintained ensures that'the Reactor Coolant System fluid released 1 l

4 will be diverted through the ice condenser bays for heat removal  !

.b and that excessive sublimation of the ice bed will not occur because of warm r intrusion. '

3/4.6.5.4 INLET 000R POSITION MONITORING SYSTEM The OPERABILITY of the Inlet Door Position Monitoring System ensures that the capability is available for monitoring the individual inlet door position.

In the event the system is inocerable, the ACTION requirements provide assur-ance that the ice bed heat removal capacity will be retained within the spec-fied time'1imits.

CATAWBA - UNIT 1 8 3/4 6-5

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.. .s 3/4.6.5.3 ICE CCNDENSER DOORS If an Ice Condenser Door is not capable of opening autmatically then syst e function is seriously degraded and a mediate action must be taken to restore the opening capability of the door. tbt capable of opening autmatically is defined as those conditions in which a door is. physically blocked fr m opening by installation of a blocking device or by obstruction frm tsporary or permanent installed equipnent.