ML19270F526

Forwards Revised Pages to Proposed Tech Specs Submitted to Clarify Base Load Mode of Operation

ML19270F526
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	02/09/1979
From:	Reed C COMMONWEALTH EDISON CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 7902150380
Download: ML19270F526 (5)

Text

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Commonwealth Edison One First National Plaza. Chicago, lilinois Address Reply to: Post Office Box 767 Chicago, Illinois 60690 February 9, 1979 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 Subjects : Zion Station Units 1 and 2 Revision to Proposed Change to

' Facility Operating License Nos. DPR-39 and DPR-48 NRC Docket Nos. 50-295 and 50-304 Reference (a):

February 2, 1979 letter from C. Reed to Harold R. Denton

Dear Mr. Denton:

Per Reference (a), Commonwi,11th Edison Company submitted technical specification changes to conform to its revised ECCS analysis for Zion Station.

Subsequent to that submittal, discussions with the NRC Staff have indicated that additional changes are nacessary to clarify the Dase Load rede of operation.

Attachment I to this letter contains proposed changes which more clearly define the power range associated with Dase Load operation.

The revised technical specifications of Attachment I have been reviewed and approved by Commonwealth Edison On-Site and Off-site Review with the ccnclusion that thero are no unreviewed safety questions.

Please address any additional questions that you might have to this office.

Three (3) signed originals and thirty seven (37) copies of this letter are provided for your use.

Very truly yours, Cordoll Rood Assistant Vice-President attachment SUBSCRIBED and SW RN to this @

,, day before me(d Un hj p of 11 1

, 1979.

y n mh r D) %.K) d'A %ts No(ary Public 2l y

ATTACHMENT I ZION STATION UNITS 1 AND 2 NRC DOCKET NOS. 50-295 AND 50-304 PROPOSED TECHNICAL SPECIFICATION CHANGES The following pages have been revised:

46a and 46b

/b SURVEILLANOE REQUIREMENT LIMITING CONDITION FOR OPERATION 4.2.2.A.

3.2.2.A.

2.2.a 2.2.a The maximum allcwed pcwer for BASE Not Applicable.

LO AD operation is the lesser of:

1. Rated thermal pcw y,(o

2. Power limited b7 LF q Z The nominal minimum power for BAbh LO AD operation is the lescer cf:

1. Maximum allowed pcuer less 5%

cf rated thermal pcwer, or

2. Pcwer limited by APDMS type surveillance.

B ASE LO AD operatian can replace cperation under APDMS type surveillance only if Section 3.2.2.n.2.2.b is satisfied.

2.2.b 2.2.b Prior to going to BASE LOAD cperation After waiting the 2h hours, ana-and prior to discontinuing APDMS type sur-lyze a full core flux map near the veillance (S ection 3.2.2. A.2.1), maintain pcwer level that is limited by APDMS the follcuing conditions for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; type surveillance. Prior to going above the power level limited by APDMS

1) Pcwer must be maintained near the type surveillance, determine from this pcwer limited by APDMS type sur-fluxmapthepcuerlimitedby[Rc(Z]",

ve111ance.

for EASE LO AD cperation.

2) 6I within a 13% zir target band.

2.2.c If the conditiens 01 dection For BASE LOAD operation, the follow-3.2.2.A.2.2.b. are satisfied, then BASE L0aD ing surveillance requirements shall operaticn may replace operation with APDFS apply:

type surveillance provided the following is (1) at less than or equal to the pcwer maintained:

level that was determined to be limited by {Fg(Z3 L for B ASE LOAD operation, obtain a full ccre flux mao at least one week, two weeks an'd monthly after achieving BASE LOAD operation.

4Ga

LIMITING CONDITION FOR OPERATION SURVEILLANCE. REQUIREMENT 4.2.2.A 3 2.2.A 2.2.c (Continued) 2.2.c.

(1) Power between the maximum and (2)

A flux difference alarm shall indicate non-conformance with minimum ihmits specified in the +3% AI target band for 3.2.2.A.2.2.a.

BAS 1FLOAD operation. If the (2) aI within the AI tr.cget band alarm is temporarily out of as per section 3.2.2.A.4 and service, conformance with the 3.2.2. A.5, except use +3% AI applicable limit and the flux target band instead of the +6, difference shall be logged

-7% AI target band, hourly for the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and half-hourly thereafter.

2.2.d If any of the requirements of Section 2.2.d Not Applicable 3 2.2. A.2.2.c. are not maintained then l

power must immediately be reduced to below the power limited by APDMS pe I

surveillance (Section 3 2.2. A.2.1 and APDMS type surveillance must be ini-tiated if the power is above P

• T 3.2.2.A.3 4.2.2.A.3 The target flux difference at aggiven The reference equilibrium indicated power level, Po, is determined b; noting axial flux difference as a function of the indicated axial flux difference at the power level (called the target flux power level with equilibrium xenon condi-difference) shall be determined at least tions established in the core, part once per equivalent full power quarter.

length rods fully withdrawn, and with the i

The target difference must be updated full length rod bank more than 190 steps l

every effective full power month. This withdrawn.

Po for the purpose of deter-may be done using the measured value for mining the target value, should be as that month or by linear extrapolation high a power level as practicable.

The using the two most recent measured va-target flux difference at any other level, lues.

The initial target flux difference on a reload may be determined from design P, is equal to the target value of PO multiplied by the ratio, P/P.

predictions.

g 1

-46b-