ML20055C042

Application for Amend to Licenses DPR-42 & DPR-60,changing Tech Spec Table 4.1-2A for Waiver of end-of-cycle Turbine Valve Test.Description of Proposed Changes & Reasons Encl

ML20055C042
Person / Time
Site:	Prairie Island
Issue date:	08/06/1982
From:	Musolf D NORTHERN STATES POWER CO.
To:
Shared Package
ML20055C034	List: ML20055C033 ML20055C042 ML20055C052
References
NUDOCS 8208100062
Download: ML20055C042 (3)

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UNITED STATES NUCLEAR REGULATORY COMMISSION NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PLAliT Docket No. 50-282 50-306 4

i REQUEST COR AMENDMENT TO.

OPERATING LICENSE NOS. UPR-42 AND DPR-60 (License Amendment Request Dated August 6,1982)

Northern States Power Company, a Minnesota corporation, requests authorization for changes to the Technical Specifications as shown on the attachments labeled Exhibit A and Exhibit B.

Exhibit A describes the proposed changes along with reasons for this change.

Exhibit B is a-set of Technical Specification pages incorporating the proposed changes.

This request contains no restricted or other defense information.

NORTHERN STATES POWER COMPANY By 44

~ 0 M Musolf Manager of Nuclear Suppo Services On this d day of da #, / 9 8 8 before me a notary public in and for said County, personally appeared D M Musolf, Manager of Nuclear Support Services,

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and being first duly sworn acknowledged that he is authorized to execute this document on behalf of Northern States Power Company, that he knows the ' contents thereof and that to the best of his knowledge, information and belief, the statements made in it are true and that it is not interposed for delay.

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BETTY J. DEAN l

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RAMSEY COUNTY

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EXHIBIT A 1

Prairie Island Nuclear Generating Plant-I License Amendment Request Dated August 6, 1982 i -

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Proposed Changes to the Technical Specifications Appendix A of Operating' Licenses DPR-42 and DPR,

4 Pursuant to 10 CFR 50.59 and 50.90, the holders of Operating Licenses DPR-42 and DPR-60 hereby propose the following changes to Appendix A, Technical Specification:

1.

Table TS.4.1 - 2A, Minimum Frequencies for Equipment Tests.

Proposed Change Add a footnote to item 11 in the table as shown on Exhibit' B.

L Reason for Change This waiver of the end of cycle turbine valve test is needed because, as the unit nears end of cycle core life with the accompanying low boron concentrations, the load reduction to'50% power to do the test becomes difficult. The xenon transients and flux tilts become: difficult-to control when the plant is at a low boron concentration.

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Khen using boron to control the reactor at low boron ~ concentrations, the plant uses many gallons of water' and/or many cubic feet of resin to remove the boron. This increases the amount of radioactive waste 4

requiring treatment and shipping along with additional exposure to personnel processing the water or the resin for disposal.. The _ plant also goes through another' unnecessary transient.

Prudent operating practice and radiation level reduction are sound reasons to minimize power cycling near the end of a cycle.

Safety Evaluation Since the beginning of plant operation we have 'not had an instance when ' the turbine _ valves did not close during testing. 'The two units

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are operating on AVT secondary water chemistry. control. Unit'2 has l

always been on AVT and Unit 1 operated on phosphate chemistry control j

for only a short time.

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' With AVT chemistry, the possibility of a sticky turbine valve is reduced.

l If the plant power is reduced to 50% near the end of cycle for any other j

reason, the plant would do the turbine valve test.

i As noted in Exhibit B, we request waiver of the turbine valve test when boron concentration is below 150 ppm.

When a unit load follows at 100 ppm, it requires twice as much water as it does at 200 ppm.

Since dilution increases exponentially as concentration decreases, the 150 ppm limit eliminates this area of highest dilution. The time j

limit of 60 days ' establishes an upper limit on waiver of-the test.

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EXHIBIT B License Amendment Request Exhibit B, attached, consists of the following revised pages of the Appendix A Technical Specifications which incorporate the proposed changes:

Pages Table TS.4.1 - 2A i

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