ML20072B644

Proposed Tech Spec Adding New Item to App A,Section 3.6.F, Jet Pump Flow Mismatch

ML20072B644
Person / Time
Site:	Pilgrim
Issue date:	02/25/1983
From:	BOSTON EDISON CO.
To:
Shared Package
ML20072B629	List: ML20072B626 ML20072B644
References
NUDOCS 8303070121
Download: ML20072B644 (3)

Text

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Attachment A Proposed Technical Specification Change Proposed Change Reference is made to Pilgrim Nuclear Power Station, Unit #1 Technical Specification, Appendix A, Section 3.6.F, " Jet Pump Flow Mismatch".

Add the following: Add new Item 3.6.F.2

2. If Specification 3.6.F.1 is exceeded immediate corrective action shall be taken. If recirculation pump speed mismatch is not corrected within 30 minutes, an orderly shutdown shall be initiated and the reactor shall be in Cold Shutdown Condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> unless the recirculation pump speed mismatch is brought within limits sooner.

Add the following: New Paragraph to Bases 3.6.F Specification 3.6.F allows 30 minutes to correct a mismatch in re-circulation pump speeds in order to take manual control of the recirculation pump MG set scoop tube positioner in the event that its control system should fail.

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Reason for Change It is important to specify an action statement in the event that a Limiting Condition of Operation (LCO) is exceeded. The inclusion in the Technical Specifications of a specific action statement minimizes potential confusion as to required actions to take when a LC0 is exceeded. This new Item 3.6.F.2 provides an action statement in the event that Item 3.6.F.1 is exceeded.

Safety Considerations This change does not present an unreviewed safety question as defined in 10 CFR 50.59(c). It has been reviewed and approved by the Operations Review Committee and reviewed by the Nuclear safety Review and Audit Committee.

Schedule for Change This change will be put into effect upon receipt of approval by NRC.

Fee Determination

• Pursuant to 10 CFR 170.12 Boston Edison Company proposes this change as Class II.

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LIMITING CONDITIONS FOR CPERATION SURVEILLANCE REQUIREMENT 3.6.D. Safcty Relisf Valves (Cont'd) E. Jet Pumps from the initial discovery of dis- Whenever there is recirculation charge pipe temperatures in excess flow with the reactor in the start-of 212*F for more than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> up or run modes, jet pump oper-

~ without prior NRC approval of the ability shall be checked daily by engineering evaluation delineated verifying that the following con-in 3.6.D.3. ditions do not occur simultaneously.

5. The limiting conditions of opera- 1. The two recirculation loops have tion for the instrumentation that a flow imbalance of 15% or more monitors tail pipe temperature when the pumps are operated at are given in Table 3.2.F. the same speed.

E. Jet Pumps 2. The indicated value of core flow rate varies from the value

1. Whenever the reactor is in the derived from loop flow measure-startup or run modes, all jet ments by more than 10%.

pumps shall be operable. If it is detennined that a jet pump is in- 3. The diffuser to lower plenum operable, an orderly shutdown shall differential pressure reading ,

be initiated and the reactor shall on an individual jet pump varies be in a Cold Shutdown Condition from established jet pump P within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. characteristics by more than 10%.

F. Jet Pump Flow Mismatch F. Jet Pump Flow Mismatch

1. Whenever both recirculation pumps Recirculation pump speeds shall be are in operation, pump speeds shall checked and logged at least once be maintained with 10% o' each per day.

Other when power level is greater than 80% and within 15% of each other when power level is less than or equal to 80%.

2. If Specification 3.6.F.1 is ex-ceeded innediate corrective action shall be taken. If re-circulation pump speed mismatch is not corrected within 30 minutes, an orderly shutdown shall be in-itiated and the reactor shall be in the Cold Shutdown condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> unless the re-circulation pump speed mismatch is brought within limits sooner.

G. Structural Integrity G. Structural Integrity

1. The structural integrity of the The nondestructive inspections primary system boundary shall be listed in Table 4.6.1 shall be maintained at the level required performed as specified. The by the ASME Boiler and Pressure results obtained from compliance Yessel Code,Section XI, " Rules with this specification will be of Inservice Inspection of Nuclear evaluated after 5 years and the Power Plant Components", 1974. conclusions of this evaluation will be reviewed with AEC.

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BASES:

3.6.F and 4.6.F

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Jet Pump Flow Mismatch The LPCI loop selection logic has been previously described in the Pilgrim ,

Nuclear Power Station FSAR. For some limited low probability accidents with '

the recirculation loop operating with large speed differences, it is possible for the logic to select the wrong loop for injection. For these limited con-ditions the core spray itself is adequate to prevent fuel temperatures from exceeding allowable limits. However, to limit the probability even further, a procedural limitation has been placed on the allowable variation in speed between the recirculation pumps.

The licensee's analyses indicate that above 80% power the loop select logic could not be expected to function at a speed differential of 15%. At or below 80% power the loop select logic would not be expected to function at a speed differential of 20%. This specification provides a margin of 5% in pump speed differential before a problem could arise. If the reactor is operating on one pump, the loop select logic trips that pump before making the loop selection.

Specification 3.6.F allows 30 minutes to correct a mismatch in recirculation pump speeds in order to take manual control of the recirculation pump MG set scoop tube positioner in the event that its control system should fail.

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