ML20151L676

Proposed Tech Spec Section 4.6.G.1,reducing Max Permissible Recirculation Loop Flow Imbalance from 15 to 10%

ML20151L676
Person / Time
Site:	FitzPatrick
Issue date:	04/14/1988
From:	POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:
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ML20151L675	List: ML20151L671 ML20151L676
References
NUDOCS 8804220107
Download: ML20151L676 (6)

Text

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ATTACHMENT I-TO JPN-88-DRAFT PROPOSED TECHNICAL SPECIFICATION CHANGES REGARDING TYPOGRAPHICAL ERROR IN SECTION 4.6.G.1 (JPTS-88-006) l New York Power Authority JAMES h. FITZPATRICK NUCLEAR POWER PLANT Docket No. 50-333 DPR-59 l

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8804220107 880414 PDR ADOCK 05000333 p DCD I

JAFNPP 4.6 (cont'd)

1. The two recirculation loops have a flow imbalance of 10 percent or more when the l' pumps are operated at the same speed.

2. The indicated value of core flow rate varies from the value derived from loop flow measurements by more than 10 percent.

3. The diffuser to lower plenum differential pressure reading on an individual jet pump varies from the average of all jet pump dif ferential pressures by more than 10 percent.

A. Whenever the reactor is in the startup/ hot standby or run modes, and there is one loop recirculation flow, jet pump operability shall be verified as follows.

a. Baseline readings will be taken and operating characteristics for the following parameters established:

1. Jet Pump Loop Flow and Recirculation Pump Speed for the operating loop.

2. Individual Jet Pump percent differential pressures for all jet pumps.

b. Initially, and daily thereaf ter, jet pump operability will be verified by assuring that the following do not occur simultaneously:

Amendment No. % g 145

NEW YORK POWER AUTHORITY James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 DPR-59 Safety Evaluation for Technical Specification Chances Recardina TvooaraDhical Error jn Section 4.6.G.1 (JPTS-88-006)

I. DESCRIPTION OF THE PROPOSED CRANGES Section 4.6.G.1 on page 145 of the FitzPatrick Technical Specifications is revised to reduce the maximum permissible recirculation loop flow imbalance from 15 to 10 percent. Section 4.6.G.1 currently reads as follows:

" The two recirculation loops have a flow imbalance of 15 percent or more when the pumps are operated at the same speed."

The change proposed revises section 4.6.G.1 to read:

"The two recirculation loops have a flow imbalance of 10 percent or more when the pumps are operated at the same speed."

II. PURPOSE OF THE PROPOSED CRANGES NRC Inspection Report 78-05 (Reference 1) identified a conflict between Section 4.6.G.1 and the bases of the FitzPatrick Technical Specifications. Specifically, open item 333/78-05-09 in Section 6 (Technical Specifications) of the inspection report indicates that:

I T. S. 4.6.G 1 maybe in conflict with its bases in that the percentage flow imbalance stated in each are different.

l Section 4.6.G.1 of the Technical Specifications prescribes l surveillance requirements regarding recirculation loop flow l imbalances to assure jet pump operability.

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A typographical error (15 percent versus 10 percent) was introduced in the initial issuance of the FitzPatrick Technical Specifications. The issuance of this proposed change will resolve this confAict and close this open item.

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Attcchm:nt II to JPN-88 014 III. IMPACT OF THE PROPOSED CKANGES The change proposed by this amendment will have no effect on either plant operation or overall plant safety. The Authority imposed an administrative limit on recirculation loop flow imbalance of ten percent.

Section 4.6.G specifies that, once each day, jet pump operability shall be checked by verifying that three conditions do not occur. These three conditions are specified in Sections 4.6.G.1, 4.6.G.2, and 4.6.G.3.

3.6 and 4.6 Bases Section G ("Jet Pumps," on page 154) describe the rationale for this surveillance requirement.

This Bases section specifically mentions the ten percent flow imbalance as the limit of acceptability in four places.

Therefore, the proposed change is consistent with existing technical bases for the FitzPatrick plant.

General Electric Company's Service Information Letter (SIL)

No. 330 (Reference 2) further verifies that ten percent value is a proper limit. In Section 5.2 of Attachment A to SIL 330, General Electric provides guidance for technical specifications on jet pump performance surveillance. Section 5.2.2 (Measurements and Criteria) lists three criteria for detecting an inoperable jet pump. Criterion (a) is similar to the proposed section 4.6.G.1 and states that individual jet pump flow deviation from average loop flow by an amount greater than 10 percent is one indicator of degraded jet pump performance.

The Authority also contacted the General Electric Co.

to determine the origin of this error. They were unable "to establish, from readily available GE records, the probable source of the apparent discrepancy" (Reference 3). They did however, confirm the applicability of the criteria in SIL-330.

IV. EVALUATION OF SIGNIFICANT KAZARDS CONSIDERATION Operation of the FitzPatrick Plant in accordance with the proposed Amendment would not involve a significant hazards consideration as stated in 10 CFR 50.92 since it would not:

, 1. involve a significant increase in the probability or l consequences of an accident previously evaluated. No l

accidents as analyzed in the FSAR are affected by these i changes. Reduced maximum permissible recirculation loop

! flow imbalance will increase the probability that a jet pump failure will be promptly identified. This change is purely administrative and does not affect plant operations or the physical arrangement of the plant in any way.

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AttachmInt II to JPN 014

2. create the possibility of a new or different kind of accident from any accident previously evaluated.

This change alters jet pump performance surveillance limits and is purely administrative. The surveillance procedures and equipment are unchanged.

3. involve a significant reduction in a margin of safety.

Administrative limits imposed since the Authority confirmed this error have assured that the actual margin of safety was not reduced.

In the April 6, 1983 FEDERAL REGISTER (48FR14870), the NRC published examples of license Amendments that are not likely to involve significant hazards considerations. Example number (i) of that list is applicable to these proposed changes and states:

"A purely administrative change to technical specifications; for example, a change to achieve consistency throughout the technical specification, correction of an error, or a change in nomenclature."

Specifically, this change corrects an error.

V. IMPLEMENTATION OF THE PROPOSED CHANGE Implementation of the proposed changes will not impact the ALARA or Fire Protection Programs at FitzPatrick, nor will the changes impact the environment.

VI. CONCLUSION The changes, as proposed, does not constitute an unreviewed cafety question as defined in 10 CFR 50.59, that is it:

a. will not change the probability nor the consequences of an accident or malfunction of equipment important to safety as previously evaluated in the Safety Analysis l Report; l

b. Will not increase the possibility of an accident or malfunction of a different type than any previously t evaluated in the Safety Analysis Report; l

c. will not reduce the margin of safety as defined in the basis for any technical specification;

d. does not constitute an unreviewed safety question; and I c. involves no significant hazards consideration, as defined in 10 CFR 50.92.

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. Attcchmsnt II to JPN 014 VII. REFERENCES AND NOTES

1. NRC letter, Region I to J. D. Leonard, Jr., dated March 14, 1978 regarding Inspection 50-333/78-05.

2. General Electric Co., Service Information Letter (SIL) No.

330, "Jet Pump Beam Cracks," dated June 9, 1980.

3. General Electric Co. letter, R. R. Bloomstrand to S. Rokerya (NYPA), dated November 5, 1985 (RRB-85-NYP-01), regarding FitzPatrick Jet Pump Operability Technical Specification.

4. NUREG/CR-3052, "Closeout of IE Bulletin 80-07," dated November 1984.

5. IE Bulletin 80-07, "BWR Jet Pump Asse: ably Failure," dated April 4, 1980.

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