ML20133A852

Safety Evaluation on Proposed Tech Spec Change Re Control Room 8-h Temp Limit from 77 F to 90 F.Eight-hour High Temp Limit Should Be 85 F Dry Bulb Temp

ML20133A852
Person / Time
Site:	Grand Gulf
Issue date:	04/04/1984
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML19276B572	List: AECM-84-0182, Informs of Intent to Restart Plant on or Before 840326 to Regenerate Units Installed in-core Startup Neutron Sources. Util Believes Immediate Restart & Operation of Plant at Power Levels of Less than 5% Core Thermal Power Is Safe AECM-84-0192, Clarifies Response to Question Written in Transcript of Commission 840320 Briefing Re Development of Tech Specs. Util Comparing Tech Specs to Fsar,Ser & Present Version of STS ML19276B571 ML19292C771 ML20132B781 ML20132B804 ML20132B820 ML20132B826 ML20132B831 ML20132B837 ML20132B841 ML20132B847 ML20132B893 ML20132B925 ML20132B930 ML20132B938 ML20132B943 ML20132B947 ML20132B964 ML20132B968 ML20132B974 ML20132B977 ML20132B985 ML20132B990 ML20132B995 ML20132C002 ML20132C007 ML20132C027 ML20132C030 ML20132C036 ML20132C041 ML20132C046 ML20132C052 ML20132C056 ML20132C060 ML20132C065 ML20132C070 ML20132C082 ML20132C089 ML20132C095 ML20132C113 ML20132C121 ML20132C126 ML20132C136 ML20132C149 ML20132C161 ML20132C165 ML20132C171 ML20132C178 ML20132C182 ... further results
References
FOIA-84-459 NUDOCS 8507200178
Download: ML20133A852 (3)

Text

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HFEB SER Input on Proposed Change to Grand Gulf Technical Specification Regarding Control Room High Temperature Limit Position Reliable human performance is degraded by extreme environmental conditions.

NUREG-0700 establishes a set of environmental confort guidelines for control i

rooms to minimize the potential for operator error during long-term operations.

It provides normal comfort ranges for environmental parameters and addresses extreme conditions only to a limited extent.

In order to evaluate human performance in extreme environmental conditions the staff must l

rely on studies supported by the Department of Defense (See reference).

Discussion By letter dated September 9,1983, Mississippi Power & Light Company has proposed a chan Station to, (1)ge in the technical specifications for Grand Gulf Nuclear delete the " Equipment Not Operating" column from the Area Temperature Monitoring Table 3.7.8-1, (2) delete the column heading

" Equipment Operating" from Table 3.7.8-1, and (3) change the 77'F limiting temperature for the control room to 90'F.

The HFEB agrees with the proposed changes and justification by the Applicant to delete the " Equipment Not Operating" column and the column heading

" Equipment Operating" from Table 3.7.8-1.

With regard to the proposed change in the limiting temperature for the control room, the staff agrees that the 77'F dry bulb temperature limit of NUREG-0700 was established as a comfort limit for long-term operation to minimize the potential for operator error due to fatigue or discomfort. This temperature limit also assumes a relative humidity below 60%.

Studies supported by the Department of Defense indicate that, for short periods of time (up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />), human operators can be expected to perform reliably in an " effective temperature" environment up to 85'F, wearing i

conventional Itght clothing, doing light, manual, seated work. Effective i

temperature takes into account dry bulb temperature, relative humidity, and l

air flow.

In the control room environment, an 85'F effective temperature can j

be composed of the following conditions:

Dry Bulb Temperature Relatlvf umidity Air Flow H

'F

'C ft/ min 85 29.5 100 0-30 90 32.2 72 0-30 95 35.0 48 0-30 70 0505 05072gs s.

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V 2-Since the technical specification is considering only dry bulb temperature and the staff cannot be assured that relative humidity will be below 72%, nor that it will not approach 100%, it is the staff position that the limiting condition for operation in the control room relative to high dry bulb temperature should be 85'F. This value is also consistent with the maximum I

effective temperature allowed in the Grand Gulf remote shutdown panel area i

when it is manned in any mode of operation.

i Conclusion

,l The staff agrees with the proposed deletion of the " Equipment Not Operating" column and " Equipment Operating" heading from Table 3.7.8-1 of the Grand Gulf technical specifications.

1 The staff does not agree with the proposed change of the control room eight-hour dry bulb temperature limit from 77'F to 90*F, but does support a change in this limit to 85'F dry bulb temperature.

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References:

>i MIL-STD-1472C, Human Engineering Design Criteria for Military Systems, i

Equipment and Facilities, May 2, 1981.

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l MIL-HDBK-759A (Proposed), Human Factors Engineering Design for Army Materiel, l

January 7,1981.

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