ML20216F379

Proposed Tech Specs SR 3/4.5.2b.1 Adding Clarification in Regard to Venting ECCS Pump Casings & Accessible Discharge Piping High Points

ML20216F379
Person / Time
Site:	Callaway
Issue date:	03/09/1998
From:	UNION ELECTRIC CO.
To:
Shared Package
ML20216F378	List: ML20216F373 ML20216F379
References
NUDOCS 9803180357
Download: ML20216F379 (6)

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ULNRC-3765 1

i ATTACHMENT THREE PROPOSED TECHNICAL SPECIFICATION REVISIONS t

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9803180357 980Sv9 '

PDR ADOCK 05000483 P PDR ..

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~4-EMERGENCY CORE COOLING SYSTEMS SURVEILLANCE REQUIREMENTS s 4.5.2 Each ECCT 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 BN-hV-8813 Safety Injection to Open RWST Isolation Vly-EM-HV-8802A(B) SI Pump Discharge Closed Hot Leg Iso Vivs-EM-HV-8835 S3fety Injection Open Cold Leg Iso Valve EJ-HV-8840 RHR/SI Hot leg Closed Recirc Iso Valve EJ-HV-8809A RHR to Accum Inj 0 pen Loops 1 & 2 Iso Viv EJ-HV-88098 RHR to Accum en

[ Loops 3 & 4 Iso Viv

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b. At least once per 31 days by:

3 1) ' Cerify ng that the ECCS piping i full of water by venting tne RHR ukSI7 C t mp casings and accessible discharge piping high points, and Ver fying that each valve (manual, power-operated, or automatic) 1 2)~

in the flow path that is not locked, sealed, or otherwise secured )

in position, is in its correct position. f

c. By a visual inspection which verifies that no lense debris (rags, 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. This visual inspection shall be performed: -

1) For all accessible areas of the contairaent prior to ~

establishing CONTAINMENT INTEGRITY, and

2) Of the areas affected within containment at the completion of each containment entry when CONTAINMENT INTEGRITY is established.

d. At least once per 18 months by: -

1) Verifying automatic isolation _ action of the RHR System from the e Reactor Coolant System by ensuring that, with a simulated or actual Reactor Coolant System pressure signal greater than or equal to 425 psig, the interlocks prevent the valves from being opened.

CALLAWAY- UNIT 1 3/4 5-4 Amendment No. 42

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EMERGENCY CORE COOLING SYSTEMS BASES ECCS SUBSYSTEMS (Continued) i The centrifugal charging pump maximum total pump flow Surveillance )

J Requirement ensures the maximum injection flow limit of 550 gpm is not exceeded. This value of flow is comprised of the total flow to the four branch lines of 469 gpm and a seal injection flow of 79 gpm plus 2 gpm for instrument uncertainties.

The safety injection pump maximum total cump flow Surveillance Require-

.nent ensures the maximum injection flow limit of 675 gpm is not exceeded.

This value of flow includes a nominal 30 gpm of mini-flow. 1 The test procedure places requirements on instrument accuracy (20 inches of water column for the charging branch lines and 10 inches of water column for the safety injection branch lines) and setting tolerance (30 inches of water column for both the charging and safety injection branch lines) such  !

that branch line flow imbalance remains within the assumptions of the safety analyses.

The maximum and minimum potential pump performance curves, in conjunc-tion with the maximum and minimum flow Surveillance Requirements, the maximum total system resistance, and the test procedure requirements, ensure that the j assumptions of the safety analyses remain valid. I I

The surveillance flow and differential pressur: requirements are the Safety Analysis Limits and do not include instruaient uncertainties. These j instrument uncertainties will be accounted for in the surveillance test  !

procedure to assure that the Safety Analysis Limits are met.

The Surveillance Requirements for leakage testing of ECCS check valves ensure that a failure of one valve will 't se an inter-system LO The Surveillance Requirement to vent t -EC&-p mp casings and acc sible, i.e., can be reached without personnel 'r , high radiation do e.ECCS discharge piping ensures against inoperable umps caused by gas bi ing  !

or water hammer in ECCS piping.

3/4.5.5 REFUELING WATER STORAGE TANK RHR uh SI] -

The OPERABILITY of the refueling water storage tank (RWST) as part of the ECCS ensures that a sufficient supply of borated water is available for injection by the ECCS in the event of a LOCA. The limits on RWST minimum volume and boron concentration ensure that: (1) sufficient water is avail-

, , able within containment to permit recirculation cooling flow to the core, and (2) the reactor will remain subcritical in the cold condition following mixing of the RWST and the RCS water volumes assuming all the control rods are out of the core. These assueotions are consistent with the LOCA analyses.

l CALLAWAY - UNIT 1 3 3/4 5-3 Amendment No.M. 68

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ATTACHMENT FOUR CHANGES TO ULNRC-3578 ATTACHMENT 20

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'. l ECCS Operating B 3.5.2

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BASES SURVEILLANCE REQUIREMENTS SR 3.5.2.3 (continued) M anh Sh pumps to the RCS full of water by venting pump casings and EM accessibleTdischarge piping high point vents ensures that the system will perform properly, injecting its full capacity into

@gt] the RCS upon demandy Accessible high point vents are those that can be reached without hazard or high radiation dose to personnel. This will also prevent water hamer, pump cavitation, and pumping of noncondensible gas (e.g., air, nitrogen, or hydrogen) into the reactor vessel following an SI signal or during shutdown cooling. The 31 day Frequency takes into 1 consideration the gradual nature of gas accumulation in the ECCS piping and the procedural controls governing system operation.

1 SR 3.5.2.4 j

Periodic surveillance testing of ECCS pumps to detect gross degradation caused by impeller structural damage or other hydraulic component problems is required by Section XI of the ASME Code. This type of testing may be accomplished by measuring the pump developed head at only one point of the pump characteristic curve. The ECCS pumps are required to develop the following differential pressures on recirculation flow:

1) Centrifugal charging. pumps a 2400 psid: 2) Safety injection '

pumps a 1445 psid: and 3) R R pumps a 165 psid. This verifies '

both that the measured performance is within an acceptable tolerance of the original pump baseline performance and that the performance at the test flow is greater than or equal to the performance assumed in the plant safety analysis. SRs are specified in the applicabh portions of the Inservice Testing Program, which encompassesSection XI of the ASME Code.

Section XI of the ASME Code provides the activities and "

Frequencies necessary to satisfy the requirements.

SR 3.5.2.5 and SR 3.5.2.6 These Surve111ances demonstrate that each automatic ECCS valve actuates to the required position on an actual or simulated SI

.. signal and on an actual or simulated RWST Level Low Low 1  ; '

Automatic Transfer signal coincident with an SI signal and that -

each ECCS pump starts on receipt of an actual or simulated SI (continued)

CALLAWAY PLANT ITS BASES B 3.5 20 5/15/97 i

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INSERT FOR B 3.5-20 The design of the centrifugal charging pump is such that significant noncondensible gases do not collect in the pump.

Therefore, it is unnecessary to require periodic pump casing venting to ensure the centrifugal charging pumps will remain OPERABLE.

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