ML17278A231
| ML17278A231 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 06/17/1985 |
| From: | Houston R Office of Nuclear Reactor Regulation |
| To: | Novak T Office of Nuclear Reactor Regulation |
| References | |
| TAC-57547, NUDOCS 8506240617 | |
| Download: ML17278A231 (6) | |
Text
8506240617 850617 PDR ADOCK 05000397 P
PDR'UN 1 V 1S85 MEMORANDUM FOR:
Thomas M. Novak', Assistant Director for Licensing, DL FROM:
SUBJECT:
R.
Wayne Houston, Assistant Director for Reactor Safety, DSI OR ACTION:
WNP-2 PROPOSED CHANGES TO THE TECHNICAL SPECIFICATIONS FOR DRYWELL AVERAGE TEMPERATURE (TAC 8 57547)
Plant Name:
Docket No.:
Region:
Responsible Branch:
Project Manager:
Due Date:
Review Status:
Washington Public Power Supply System (WNP-2) 50-397 V
LB82 J. Bradfute June 19, 1985 Complete By a letter dated April 19, 1985, the Washington Public Power Supply System proposed certain changes to section 4.6. 1.7 of the Technical Specifications for WNP-2.
The proposed changes were necessitated due to a design change of the drywell cooling system (a non-safety system) that was implemented during the last outage.
This change provided an improved air flow pattern resulting in reduced temperature gradients in the drywell.
Specifically, the licensee requested a change to Surveillance Requirement 4.6.1.7 which identified the thermocouple locations used to determine the drywell average air temperature.
The proposed TS change in Surveillance Requirement 4.6.1.7 changes the elevation and azimuth location of the thermocouples as originally specified to inlet locations of the air coolers.
To improve the temperature profile in the drywell, the licensee modified the air flow patterns of the drywell unit coolers.
This was accomplished by ducting the hot air in the annulus region, between the reactor pressure vessel and the sacrificial shield wall, through the unit coolers located in the lower portion of the drywell, rather than the upper portion in the original design.
Had the licensee used the same thermocouples specified in Surveillance Requirement 4.6. 1.7, the resulting drywell average temperature would be greater than the expected drywell average temperature due to the impingement of the annulus hot air on the thermocouples.
CONTACT:
F. Eltawila, CSB:DSI X29488
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Thomas N. Novak Therefore, the licensee proposed thermocouple locations at the inlet of the unit coolers where the inlet air temperature would be more representative for determining the drywell average temperature.
The licensee indicated that the temperature readings from the new thermocouple locations are neither influenced by the annulus hot air or the drywell unit cooler discharged air and, therefore, will yield more correct values for computing the bulk average drywell air temperature.
Based on our assessment of the proposed technical specification
- change, we recommend its approval since the original intent of the LCO is being maintained.
Enclosed is our SALP input for this review.
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Enclosure:
As Stated, R.
Wayne Houston, Assistant Director for Reactor Safety, DS I cc:
R. Bernero H. Thompson W. Butler J. Bradfute
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i ENCLOSURE 2
- -valuation Criteria
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Cate or
- SALP, Prepared by the Containment Systems Branch WNP-2 Narrative Oescri tion
~agement Involvement proach to 'Resolution Technical Issues The licensee submittal regarding this issue, lacks most of the relevent information needed to conduct a thorough review.
This required several Telecog to obtain the necessary information.
sponsiveness forcement History portable Events affing aining
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