ML20153B078

Safety Evaluation Re Employee Concern Element Rept 213.03, Inadequate Electrical Design Criteria Inadequate Consideration Given to Electrical Stds & Guides

ML20153B078
Person / Time
Site:	Sequoyah
Issue date:	03/11/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
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References
NUDOCS 8803210372
Download: ML20153B078 (2)

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SAFETY EVALUATION BY THE OFFICE OF SPECIAL PROJECTS EMPLOYEE CONCERN ELEMENT REPORT 213.03

"!NADE0VATE ELECTRICAL DESIGN CRITERIA INADEQUATE CONSIDERATION GIVEN TO ELECTRICAL STANDARDS AND GUIDES" TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR POWER PLANT UNITS 1 AND 2 I.

SUBJECT Category:

Engineering (20000)

Subcategory:

Electrical Procedures (21300)

Element:

Inadequate Electrical Design Criteria.

Inadequate Consideration given to Electrical Standards and Guides. 421303)

Employee Concern:

WI-85-100-019 The basis for Element Report 21303 Revision 1, dated January 19, 1987, is an employee concern stating "Electrical Standards and Guides are treated as guides and are not incorporated in design criteria requirements.

Electrical i

design criteria, where it exists, is not ccmplete, is vague and in general is inadequate."

II.

SUMMARY

OF ISSUE In 1986, TVA contracted Gilbert /Comonwealth Inc. to perform a technical review of Sequoyah modifications.

Gilbert /Comonwealth concluded that design criteria were "fragmented." As a result, TVA established a Design Basis Document Program (080P) to update the design criteria documents and capt,re licensing cor:nitments and regulations.

The DBDP program had an evaluation team to review the electrical design criteria.

The evaluation team found the criteria to be adequate with some exceptions.

These exceptions were incorporated into the design criteria documents.

The team also reviewed the Sequoyah Design Criteria Manual index and was unable to verify the existence of design criteria for:

(1) Overall Plant Security System, (2) Instrumentation and Controls, (3) Comunications, and (4) Lighting.

Additionally, several design criteria were identified in the index but were never issued.

These unissued criteria are for (5) Emergency Operations Facility, (6) Safety Related Display Instrumentation, (7) Emergency Fire Protection Comun' cations System, and (8) Thermal Overload and Torque.

8803210372 880311 PDR ADOCK 05000328 P

PDR III

_E_ VALUATION Based on the material presented in EN 21303, Rev. 1, we agree with the TVA resolutions of these eight issues which are discussed below:

1.

Sufficient design criteria for plant security exist in two other design documents SQN-DC-V-23.0 "Security-Power Block" and SQN-DC-V-23.1 "Electrical Security and Communication Equipment - Power Block Project."

2.

TVA will issue design criteria before September 30, 1987.

TVA' justifies the delay as follows:

(a) requirements exist in the systen's design criteria, (b) I&C calculations have been evaluated for restart, (c) requirements for instrument sense lines exist, (d) no major I & C changes are planned.

3.

TVA will issue communication system design criteria by December 15 1987.

Portions that are important to safety are covered by other systems.

4 TVA will issue lighting criteria by December 31, 1987.

Portions are covered by other systems.

5.

The TVA central emergency control center is now in Chattanooga and a site EOF is no longer required.

6.

The safety-related display instrumentation has been incorporated into the post accident monitoring design criteria.

7.

The. criteria for fire protection communication are included in the communications system and will be revised by December 15, 1987.

8.

The criteria for thermal overloads and torque will be developed and issued prior to restart.

IV.

CONCLUSION TVA has reviewed many systems for adequate design criteria even though only electrical design criteria are addressed in the employee concern.

The corrective action and time frame proposed by TVA tre reasonable.

Based on our review, we find TVA's investigation, evaluation and the corrective action plans to resolve the employee concern as described in EN-21303 SQN, Rev.

I acceptable and believe that implementation of these corrective actions will close the issue.

Verification of corrective actions which TVA has identified as a restart item should be verified by NRC inspectors in a future inspection.

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