ML20246B631

Safety Evaluation Supporting Amend 25 to License NPF-62

ML20246B631
Person / Time
Site:	Grand Gulf, Clinton
Issue date:	08/17/1989
From:	Office of Nuclear Reactor Regulation
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Shared Package
ML20246B618	List: ML20246B613 ML20246B624 ML20246B631
References
NUDOCS 8908230415
Download: ML20246B631 (3)

Text

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 25 TO FACILITY OPERATING LICENSE NO. NPF-62 CLINTON POWER STATION, UNIT N0. 1 ILLIN0IS POWER COMPANY, ET AL.

DOCKET NO. 50-461

1.0 INTRODUCTION

By letter dated May 18, 1988, the Illinois Power Company (IP), et al. (the licensees) requested an amendnent to facility Operating License No. NPF-62 for the Clinton Power Station, Unit 1.

The proposed amendment would revise Technical Specification Table 3.3.2-1 to add a note providing additional information regarding the channel configuration for the Main Steam Line (MSL)

Turbine Building Temperature - High trip channels. These channels provide for automatic isolation of the main steam lines.

2.0 EVALUATION The MSL Turbine Building Temperature sensors are arranged such that five areas are monitored with four temperature sensors in each area.

Each of the four temperature sensors in a particular area is associated with a separate division.

(The "A" sensor is associated with Division I, the "B" sensor is associated with Division II, the "C" sensor is associated with Division III, and the "D" sensor is associated with Division IV.) Each sensor (thermocouple) provides a signal to a temperature module (trip unit). The relay contacts associated with the temperature modules within a particular division are connected in series. Thus, there are four divisional strings (channels) of l

temperature mocules with five temperature modules in each string (channel).

If any temperature racdule is tripped within a channel, then a trip occurs for thbt division. A channel is considered inoperable if one or more temperature modules ond/or sensors within that channel is inoperable.

Each channel provides input into each of four two-out-of-four logics.

It therefore requires a trip from at least two divisions (i.e., channels) to initiate a nain steem line isolation (MSIV closure).

The ACTIONS and OPERABILITY requirements for the MSL isolation instrumentation of Specification 3.3.2 are structured in accordance with the any-two-from-four sensor logic scheme. Thus, four channels are assumed and each channel is associated with one of four divisions. Since there are 20 sensors associated with the Main Steam Line Turbine Building trip system, the licensee has proposed adding a note to Table 3.3.2-1 to clarify this configuration with the four channel format. The proposed note would read as follows:

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Each channel consists of five temperature modules and their associated sensors. A channel is OPERABLE if and only if five temperature modules and their associateo sensors are OPERABLE.

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-E-This r.ote is intended to clerify the OPERABILITY requirements for the Main Steam Line Turbine Building Temperature channels, thus, eliminating any confusion regarding compliance with the Limiting Condition for Operation and the associated ACTIONS.

3.0 ENVIRONMENTAL CONSIDERATION

This amendment only involves a change in surveillance requirements for the facility. The staff has determined that the amendment involves no significant increase in the amounts, and no significant change in the types, of any effluents 4

that may be relcased offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure. The Comir.ission has 4

-previously issued a proposed finding that this amendment involves no significant l

hazards consideration and there has been no public comment on such finding, j

Accordingly, this amendment meets the eligibility criteria for categorical exclusionsetforthin10CFR51.22(c)(9). Therefore, pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be

-prepared in connection with the issuance of this amendment.

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4.0 CONCLUSION

The proposed change to Technical Specification Table 3.3.2-1 to add a note

-providine additieral information regarding the channel configuration for the

. Main Steam Line (MSL) Turbine Building Temperature - High trip channels is acceptable.. The note is consistent with the design and function of the system and woulc provide clarification for the operations staff. The intent of the I

existing Technical Specification would remain unchanged.

The NRC staff has concluced, based on the considerations discussed above, that:

1 (1) there is reasonable assurance that the health arid safet not be endangered by operation in the proposeo manner, (2) y of the public will such activities will be conducted in complicnce with the Commission's regulations and, (3) the issuance of this amendment will r.ot be inimical to the common defense and security or to the health and safety of the public.

Principal Contributor:

John B. Hickraan, NRR/PDIII-2 L

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Dated.

August 17, 1989 l

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August 17, 1989 Docket No. 50-461L DISTRIBUTION Docket tile NRC & Local PDRs PDIII-2 r/f MVirgilio Mr. Dale L. Holtzscher LLuther JHickman

- Acting Manager - Licensing and Safety OGC DHagan

'Clinton Power Station EJordan TMeek (4)

P. O. Box 678 WJones.

JCalvo

~ Mail Code'V920 ACRS(10)

GPA/PA Clinton, Illinois 61727 OC/LFMB Plant file

SUBJECT:

TECHNICAL SPECIFICATION CHANGE REQUEST TO ADD A NOTE REGARDING THE CHANNEL CONFIGURATION FOR THE MAIN STEAM LINE TURBINE BUILDING TEMPERATURE TRIP CHANNELS (TACNO.69550)

RE:

Clinton Power Station, Unit No. 1 The Commission has issued the enclosed Amendment No. 25 to Facility Operating License No. NPF-62 for the Clinton Power Station, Unit No. 1.

This amendment consists of. changes to the Technical Specifications (TSs) in response to your application dated May 18, 1988.'

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This amendment revises Technical Specification Table 3.3.2-1 to add a note providing additional information regarding the channel configuration for the MainSteamLine(MSL)TurbineBuildingTemperature-Hightripchannels.

' A copy of our Safety Evaluation is also enclosed. Notice of Issuance will be included in the Commission's biweekly Federal Register notice.

Sincerely,

/s/

j John B. Hickman, Project Manager Project Directorate III-2 Division of Reactor Projects III, IV, V, and Special Projects Office of liuclear Reactor Regulation

Enclosures:

1.

Amendment No. 25 to License No. NFF-62 2.

Safety Evaluation -

.cc w/ enclosures:

See next page NW

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