ML20236U841

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Proposed Tech Specs 4.6.2.2.1 & 4.6.2.2.2,revising Testing Acceptance Criteria to Demonstrate Operability of Casing Cooling & Outside Recirculation Spray Pumps
ML20236U841
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 07/28/1998
From:
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20236U827 List:
References
NUDOCS 9807310107
Download: ML20236U841 (12)
v • d • e


Text

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45-16-M y ccnrArmieursysisus COMrANAENT REElRCULATION SHMY SYSTEM SURVOLLANCE REQUIREMENTS 4.6.2.2.1 Each containment recirculation spray subsystem and casing cooling subsystem shall be demonstrated OPERABLE:

a. At least once per 31 days by verifying that each valve (manual, power operated or automatic) in the flow path that is not lodted, sealed or otherwise secured in position, is in its correct position.
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c. At least once per 18 months by:

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1. Verifying that on a Containment Pressure - High High signal, each casing cooling pump starts automatically without time delay, and each recirculation spray pump starts automatically with the following time delays: inside 19519.75 seconds, outside 210121 seconds.
2. Verifying that each automatic valve in the flow path actuates to its correct j position on a containment pressure high-high test signal.
d. At least once per 10 years by performing an air or smoke flow test through each l spray header and verifying each spray noule is unobstructed.

4.6.2.2.2 The casing cooling tank shall be demonstrated OPERABLE:

a. At least once per 7 days by:
1. Vertfying the contained borated water volume ire ths tank, and
2. Verifying the boron concentration of the water,
b. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the casing cooling tar.k temperature.

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  • 5 M acg Pros a A NORTH ANNA UNIT 1 3/4 6-12a Amendment No. 4,-Me T l

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9807310107 980728 '

PDR ADOCK 05000330 P PDR

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l Unit 2 Mark-up of Tt.chnical Specifications Changes l

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05-16-94 1

CONTAMAENTs/ STEMS 1

CONTAMIENT RECIRCULATION SPRAY SYSTEM i

SURVElu.ANCE REQUIREMENTS (Con We ,

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c. At least once per 18 mcnths by:  ;

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1. Verifying that on a Containment Pressure - High High signal, each casing cooling pumps starts automatically without time delay, and each recirculation spray pump starts automatically with the following time delays: inside 19519.75 seconds, outside 210 121 seconds.

2.

Verifying that each automate valve in the flow path actuates to its correct l position on a Containment Pressure - high-high test signal.

d.

At least once per 10 years by performing an air or smoke flow test through each l spray header and verifying each spray noule is unobstructed.

4.6.2.2.2 The casing cooling tank shall be demonstrated OPERABLE:

a. At least once per 7 days by:
1. Verifying the contained borated water volume in the tank, and
2. Verifying the boron concentration of the water.
b. A6 !3ast once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the casing cooling tank temperature.

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NORTH ANNA - UNIT 2 3/4 6-12 Amendment No.163

05-16-94 cONTAWENTSYSTEMS CONTAINMENT RECIRCUI.ATON SPRAY SYSTEM SURVEll.l.ANCE REQUIREMENTS (Continued) b.

Verifying, that on recirculation flow, each outside recirculation spray pump develops a discharge pressure of greater than or equal to 11C psig and each casing cooling pump oevelops a discharge pressure of greater than or equal to 46 psig when tested pursuant to Specification 4.0.5.

c. At least once per 18 mor:ths by:
1. Verifying that on a Containment Pressure - High High signal, each casing cooling pumps starts automatically without time delsy, and each recirculation spray pump starts automatically with the following time delays: inside 195 4. P.75 seconds, outside 210 2,21 seconds.

2.

Verifying that each automatic valve in the flow path actuates to its correct l position on a Containment Pressure - high-high test signal.

d.

At least once per 10 years by performing an air or smoke flow test through each l spray header and verifying each spray noule is unobstructed.

4.6.2.2.2 The casing cooling tank shall be demonstrated OPERABLE:

a. At least once per 7 days by:
1. Verifying the contained borated water volume in the tank, and
2. Verifying the boron concentration of the water.
b. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the casing cooling tank temperature.

NORTH ANNA - UNIT 2 3/4 6-12 Amendment No.163

Attachment 3 Proposed Technical Specification.s Changes North Anna Power Station Units 1 and 2 Virginia Electric and Power Company Attachment 2 l

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l Unit 1 Proposed Technical Specifications Changes 1

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1 CONTAINMENT SYSTEMS 1

CONTAINMENT RECIRCULATION SPRAY SYSTEM l SURVEILLANCE REQUIREMENTS 4.6.2.2.1 Each containment recirculation spray subsystem and casing cooling subsystem shall be demonstrated OPERABLE:

a. At lea 3t once per 31 days by verifying that each valve (manual, power operated or l

automatic) in the flow path that is not locked, sealed or otherwise secured in position, I is in its correct position.

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b. Verify each RS and casing cooling pump's developed head at the flow test point is greater than or equal to the required developed bead. The frequency shall be in accordance with the Inservice Testing Program.
c. At least once per 18 months by:
1. Verifying that on a Containment Pressure liigh-liigh signal, each casing cooling pump starts automatically ivithot. time delay, and each recirculation spray pump starts automatically with tne following time delays: inside 195 i 9.75 seconds, outside 210 i 21 seconds.
2. Verifying that each automatic valve in the flow path actuates to its correct position on a containment pressure high-high test signal.
d. At least once per 10 years by performing an air or smoke flow test through each spray header and verifying each spray nozzle is unobstructed.

4.6.2.2.2 The casing coolant tank shall be demonstrated OPERABLE:

a. At least once per 7 days by:
1. Verifying the contained borated water volume in the tank, and
2. Verifying the boron concentration of the water.
b. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the casing cooling tank temperature.

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l NORTII ANNA - UNIT I 3/4 6-12a Amendment No. 6H&2,

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4 Unit 2 I I

Proposed Technical Specifications Changes l

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. .. . -~l CONTAINMENT SYSTEMS CONTAINMENT RECIRCULATION SPRAY SYSTEM

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SURVEILLANCE REQUIREMENTS (Continued) l

b. Verify each RS and casing cooling pump's developed head at the now test point is greater than or equal to the required developed head. The frequency shall be in accordance with the Inservice Testing Program,
c. At least once per 18 months by:
1. Verifying that on a Containment Pressure-IIigh-liigh signal, each casing cooling pump starts automatically without time delay, and each recirculation spray pump starts automatically with the following time delays: inside 19519.75 seconds, outside 210 t 21 seconds.
2. Verifying that each automatic valve in the flow path actuates to its correct position on a Containment Pressure - high-high test signal.
d. At least once per 10 years by performing an air or smoke now test through each spray header and verifying each spray nozzle is unobstructed. ,

4.6.2.2.2 The casing coolant tank shall be demonstrated OPERABLE:

a. At least once per 7 days by:
1. Verifying the contained borated water volume in the tank, and
2. Wrifying the boron concentration of the water.
b. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the casing cooling tank temperature. J i

NORTli ANNA - UNIl'2 3/4 6-12 Amendment No. 463,

  • L Attachment 4 Significant Hazards Consideration Determination i

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l North Anna Power Station

_ Units 1 and 2 Virginia Electric and i)ower Company  !

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SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION k

The current Technical Specification Surveillance Requirements require the Casing Cooling and outside recirculation spray (ORS) pumps to develop a discharge head  !

pressure to demonstrate operability. This is accomplished by verifying that on recirculation flow, each outside recirculation spray pump develops a discharge pressure {

of greater than or equal to 115 psig, and that each Casing Cooling pump develops a '

discharge pressure of greater than or equal to 58 psig for Unit 1 and 46 psig for Unit 2.

In response to the recommended corrective actions to station Deviation Reports and Potential Problem Report, the proposed changes will provide new acceptance criteria based upon the current plant conditions. Changes will verify operability that each RS and casing cooling pump's developed head at the flow test point is greater or equal to the required developed head. This is consistent with the acceptance criteria specified in NUREG-1431, " Standard Technical Specifications, Westinghouse Plants" and provides a more accurate assessment of pump performance.

Standard Technical Specifications Surveillance Requirement (NUREG-1431) for the Recirculation Spray System requires the verification of each RS and casing cooling pump's developed head at tne flow test point to be greater than or equal to the developed head in accordance with the Inservice Testing Program. The proposed changes will revise the current verification requirements for the ORS and the Casing Cooling pumps to be consistent with the Standard Technical Specifications.

Casing Cooling and ORS pumps which meet the proposed acceptance criteria during periodic testing will be capable of supplying the required design basis flow to containment during a Loss of Coolant Accident (LOCA) or a Main Steam Line Break (MSLB). The proposed changes to the Technical Specifications refer to the PT program to ensure that the Casing Cooling and ORS pumps will supply the minimum or i greater design basis flows to containment during a LOCA or MSLB. Tnere is no safety i significance since the pump performance data obtained with the periodic test ]

proceuures are in agreement to the vendor's pump curves used in the system l calculation. The data shows no trends for any pump degradation.

Virginia Electric and Power Company has reviewed the requirements of 10 CFli 50.92 j as they relate. to the proposed changes for the North Anna Units 1 and 2 and ,

determined that the changss do not pose a significant hazards consideration. There is l no safety significance since the pump performance data obtained with the periodic test I procedures are in close agreement to the vendor's pump curves used in the system calculation. The data shows no trends for any pump degradation. Specifically, j operation of the North Anna Power Station in accordance with the proposed Technical i Specification changes will not:

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,1. Involve a significant increase in the probability or consequences of an accident as

- previously evaluated The applicable UFSAR accidents previously evaluated are the LOCA and MSLB. The proposed changes ensure that the Casing Cooling and ORS pumps will perform properly with no unacceptable degradation by using the correct pump test acceptance criteria as controlled by the PT program. This does not increase the probability of a LOCA or MSLB.

2. Create the possibility of a new or different type from any accident previously evaluated The proposed changes to the Technical Specifications will ensure that the Casing Cooling and ORS pumps are tested at the frequency established by the Inservice Testing Program to confirm their ability to provide design basis flow during a LOCA/MSLB. This will not result in any physical alteration to any plant system, nor would there be a change in the method by which any safety related system performs its function. The design and operation of the  !

Casing Cooling and ORS systems are not being changed. Also, the proposed changes do not affect the design, operation or failure modes of the Casing Cooling and ORS pumps and other components within the Casing Cooling and ORS systems. Therefore, the proposed changes do not create the possibility of a new or different kind of accident from any accident previously evaluated.

3. Involve a significant reduction in a margin of safety implementation of the proposed changes ensures that the Casing CCng and ORS pumps do not operate with unacceptable degraded flows during a LOCA/MSLB that are less than their containment anWysis design basis flow.

Therefore, the proposed changes would not reduce the margin of safely.

Therefore, the proposed changes to The North Anna Unit 1 and 2 Technical Specifications do not involve a significant increase in the probability or consequences of a previously evaluated accident, do not create the possibility of a new or different kind of accident, and do not involve a significant reduction in a margin of cafety.

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