ML20140D008

Proposed Tech Specs,Revising TS Surveillance Requirement Re ECCS Pump Casings & Discharge Piping High Points Outside of Containment

ML20140D008
Person / Time
Site:	Byron
Issue date:	05/31/1997
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20140D005	List: ML20140D001 ML20140D008
References
NUDOCS 9706100186
Download: ML20140D008 (4)

Text

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0l EMERGENCY CORE COOLING SYSTEMS SDRVEILLANCE REQUIREMENTS 4.5.2 Each ECCS subsystem shall be demonstrated OPERABLE:

a.

At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by verifying that the following valves are in the indicated positions with power to the valve operators removed:

Valve Number Valve Function Valve Position MV SI8806 Suction to the SI Open Pumps MDV SI8835 SI Pump Discharge Open*

To RCS Cold Legs MDV SI8813 SI Pump Recirculation Open To The RWST MDV SI8809A RHR Pump Discharge to Open*

RCS Cold Legs MDV SI88098 RNR Pump Discharge to Open*

RCS Cold Legs MDV SI8840 RHR Pump Discharge to Closed RCS Hot Legs MDV SI8802A SI Pump Discharge to Closed RCS Hot Legs MD .SI 2B SI Pump Discharge to po'r b k IIIV'4)b %10Ey$> - RCS Hot Le s Close L = --

g b.akleastonceper31daysby: ("ff - --

1) Venting the E M ump outside of containeen , andsings and discharge piping ighpaint [>

2) vejirVo. lye.S >

Verifying that each valve (manual, power-operated, o ^aut554tTtT' 7T in the flow path that is not locked, sealed, or et ise -

secured in position, is in its correct position re a= c to U RN c.

By a visual inspection which verifies that no loose debr gs trash, clothing, etc.) is present in the containment which could be transported to the containment sump and cause restriction of the pump suctions during LOCA conditions.

f be performed: " This_ visual inspection shall'

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Valves may be realigned for testing pursuant to Specification 4.4.6.2.2.

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V, EMERGENCY CORE COOLING SYSTEMS SURVEILLANCE REQUIREMENTS 4.b.2 Each ECCS subsystem shall be demonstrated OPERABLE: I

a. At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by verifying that the following valves are in the indicated positions with power to the valve operators i removed:

Valve Number Valve Function Valve Position MOV SI8806 Suction to the SI Open Pumps i

MOV SI8835 SI Pump Discharge Open*

To RCS Cold Legs MOV SI8813 SI Pump Recirculation Open l

To The RWST i

i MOV SI8809A I RHR Pump Discharge to Open*

l RCS Cold Legs MOV S188098 RHR Pump Discharge to Open*

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RCS Cold Legs l MOV SI8840 RHR Pump Discharge to Closed  !

, RCS Hot Legs MOV SI8802A SI Pump Discharge to Closed RCS Hot Legs  !

MOV SI8802B SI Pump Discharge to Closed RCS Hot Legs '

b. At least once per 31 days by

1) Venting the ECCS pump casings and discharge piping high points outside of containment, and '

2) Verifying that each valve (manual, power-operated, or automatic) l in the flow path that is not locked, sealed, or otherwise i

secured in position, is in its correct position.

c. By a visual inspection which verifies that no loose debris (rags, trash, clothing, etc.) is present in the containment which could be transported to the containment sump and cause restriction of the l pump suctions during LOCA conditions. This visual inspection shall be performed:

i j " Valves may be realigned for testing pursuant to Specification 4.4.6.2.2.

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l BYRON - UNIT g2 3/4 5 AMENDMENT N05.) # ag[

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. EMERGENCY CORE C0OLINg SYSTEMS

, BASES ECCS SUBSYSTEMS (Continued)

The limitation for a maximum of one centrifugal charging pump to be OPERABLE and the Surveillance Requirement to verify all charging pumps except the required OPERABLE Charging pump to be inoperable in MODE 4 with one or more of the RCS cold legs less than or equal to 330*F, MODE 5, and MODE 6 with r

)

the reactor vessel head on, provides assurance that a mass addition pressure N transient can be relieved by the operation of a single PO D or RHR suction )

relief valve. Similarly, the requirement to verify all Safety Injection pumps are inoperable in MODE 4 with the temperature of one or more of the RCS Cold Legs less than or equal to 330*F, in 400E 5 with pressurizer level greater than 5 percent (Level 409.5') and in MODE 6 with pressurizer level greater than 5 percent and the reactor vessel head resting on the reactor vessel flange, provides assurance that a mass addition pressure transient can be relieved by (

a single PORY or RHR suction relief valve.

In MODE 5 and MODE 6 with pressurizer level less than or equal to 5 percent, /

at least one Safety Injection pump or gravity feed from the RWST must be avail- V able to mitigate the effects of a loss of decay heat removal during partially )

drained conditions. Surveillance requirements assure availability, but prevent /

inadvertent actuation during these modes. The desired flow path for the SI (

pump or gravity feed varies with RCS configuration and is, therefore, procedurally )

addressed.

The Surveillance Requirements define what constitutes an udequate hot side vant for various plant conditions. It was determined that removing the reactor vessel head was an adequate vent under all conditions. Other venting alterna-tives have restrictions based on time from shutdown and RCS temperature. The values in the surveillance were taken from the graph on the following page, g The Surveillance Requirements provided to ensure OPERABILITY of each component ensures that at a minimum, the assumptions used in the safety analyses are met and that subsystas OPERA 81LITY is maintained. Surveillance Requirements for throttle valve position stops and flow balance testing provide assurance that proper ECCS flows will be maintained in the event of a LOCA. Maintenance of proper flow resistance and pressure drop in the piping system to each injection point is necessary to: (1) prevent total pump flow from exceeding runout conditions when the system is in its minimum resistance configuration, (2) provide the proper flow split between injection points in accordance with the assumptions used in the ECCS-LOCA analyses, and (3) provide an acceptable level of total ECCS flow to all injection points equal to or above that assumed in the ECOS-LOCA analyses. The Surveillance Requirements for leakge testing of ECCS check valves ensures that a failure of one valve will not cause an intersystem LOCA. In Mode 3, with pressurizar pressure below 1000 psig, the accumulators will. be available with their isolation valves either closed but energized, or open, whenever a S!8809 valve is closed to perform check valve leakage testi

@B[RON-URITS1serTA 2 8 1/4 S-2 AMENDMENT NO.

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INSERT A i

For Unit 1, Surveillance Requirement 4.5.2.b.1 requires that the ECCS pump casings and l discharge piping high points equipped with vent valves be vented on a 31 day frequency.

This venting surveillance does not apply to subsystems in communication with operating systems because the flows and/or pressures prevalent in these systems are sufficient to provide confidence that water hammer which occurs from voiding would not result in unacceptable dynamic loads. Diring normal operation, this exclusion would apply to the High Head Safety Injection subsystem. During shutdown cooling operation, the exclusion would apply to the single re luired centrifugal charging pump and operating RH pump, in addition to the ECCS piping in commur.ication with the operating pumps. ,

Because the centrifugal charging pumps are not equipped with pump casing vent valves, and the pump design and system piping configuration allow the pumps to be maintained under positive pressure when in standby, manual venting of these pumps is not required. I 1

The surveillance requirement to uhrasonically examine selected portions of piping l involves the idle CV pump discharge piping up to the first check valve on the pump discharge and miniflow lines, and the stagnant portion of the piping upstream of the ISI8801 A/B adjacent to the vent valve ISIO45. This will provide added assurance that l the piping is water solid.

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