ML17146B102

Cycle 3 Proposed Startup Physics Tests Summary Description.

ML17146B102
Person / Time
Site:	Susquehanna
Issue date:	11/30/1987
From:	PENNSYLVANIA POWER & LIGHT CO.
To:
Shared Package
ML17146B090	List: ML17146B089 ML17146B092 ML17146B094 ML17146B095 ML17146B096 ML17146B102 ML18040B194
References
PROC-871130, NUDOCS 8801080091
Download: ML17146B102 (5)

Text

SUSQUEHANNA SES UNIT 2 CYCLE 3 PROPOSED STARTUP PHYSICS TESTS

SUMMARY

DESCRIPTION NOVEMBER 1987 PENNSYLVANIA POWER 8( LIGHT COMPANY 880i08009i 87i223 PDR ADQCK 05000388 ggg PDR

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~r SUS UEHANNA SES UNIT 2 CYCLE 3 PROPOSED STARTUP PHYSICS TESTS

SUMMARY

DESCRIPTION Susquehanna SES Unit 2 will be shutting down for its second refueling and inspection outage on March 5, 1988. Prior to resumption of full power commercial operation for Cycle 3, PPGL plans to perform a series of startup tests to assure that, the reload core conforms to the design. A list of these proposed tests along with a brief description for each is provided below.

1) Core Loadin Verification

Purpose:

To assure the core is correctly loaded per design.

Description:

The core will be visually checked to verify correct loading.

An underwater video camera or suitable device will be used to record fuel assembly serial numbers, orientations, core locations, and proper core plate seating. A review of the videotape will be performed and will serve as an independent verification of the core loading. Any discrepancies discovered will be promptly corrected and the affected areas reverified prior to Unit 2 Cycle 3 startup.

2) Control Rod Functional (Insert and Withdrawal Checks)

Purpose:

To assure proper control rod function.

Description:

A control rod functional test, which includes mobility and overtravel checks, will be performed on each control cell loaded in its final configuration. Core subcriticality will be demonstrated and documented as each control rod is functionally tested.

3) Subcritical Shutdown Margin Demonstration

Purpose:

To assure that at least the minimum required Shutdown Margin exists with the strongest worth control rod fully withdrawn.

Description:

This test will verify that at least the required amount of Shutdown Margin is maintained without determining the actual amount. The analytically determined strongest worth control rod (or its symmetric counterpart) is fully withdrawn; diagonally adjacent control rods (one at a time) are then slowly notched out, verifying subcriticality at each step, until the analytically determined reactivity worth of the diagonally adjacent control rods at their respective notch position just equals or slightly exceeds the required amount of Shutdown Margin. Verification at this step that the core is still subcritical demonstrates that at least the required amount of Shutdown Margin exists.

4) In-Se uence Critical and Shutdown Margin Determination

Purpose:

a) To determine the actual amount of Shutdown Margin.

b) To compare predicted versus actual critical control rod positions.

Description:

This test will be performed as part of the normal startup.

Control rods are pulled in group order in their normal sequence until criticality is achieved. Taking into account the period and moderator temperature coefficient corrections, the Shutdown Margin is determined by calculation. In addition, to assure that there is no reactivity anomaly, the actual critical control rod position is verified to be within 1% ~k/k of the predicted critical control rod position.

Purpose:

a) To assure proper operation of the TIP system.

b) To check core symmetry.

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Description:

A gross asymmetry check will be performed as well as a detailed statistical uncertainty evaluation of the TIP system. A complete set of TIP data will be obtained at a steady-state power level greater than 75% of rated power. A total average deviation or uncertainty will be determined for all symmetric TIP pairs as well as a maximum absolute deviation. The results will be analyzed to assure proper operation of the TIP system and symmetry of the core loading.