ML20206C206

Rev 3 to Electrical Control Cabinets Re Const, TVA Employee Concerns Special Program

ML20206C206
Person / Time
Site:	Sequoyah
Issue date:	04/01/1987
From:	Russell Gibbs, Huff G, Manning C TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20206C172	List: ML20206C168 ML20206C206 ML20206C275 ML20206C335 ML20206C425 ML20206C446 ML20206C473
References
C010505-SQN, C010505-SQN-R03, C10505-SQN, C10505-SQN-R3, NUDOCS 8704130017
Download: ML20206C206 (5)

Text

4 TVA EMPLOYEE CONCERNS REPORT NUMBER: C010505-SQN SPECIAL PROGRAM REPORT TYPE: Sequoyah Nuclear Plant Element REVISION NUMBER: 3 (Final Report)

TITLE: Electrical Control Cabinets as Related PAGE 1 0F 4 to Construction REASON FOR REVISION:

Revised to incorporate TAS and SRP comments. Revision 1 Revised to incorporate NRC Revision 2 Comments and Finalize Report Added concern number to introduction section and Attachment "A" and refinalize report Revision 3 PREPARATION '

PREPARED BY:

.5-2d-/ 7

[ SIGjpngIRE REVIEWS DATE PEER:

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3-26-87 DATE Q TURE 3/27/h7

'g SIGNATURE / DATE CONCURRENCES CEG-H: ( /

SRP: n?b M ff/ 3

• 3 0 *$ )

SIGNATURE DATE ~ SIGNA 711RE* DATE APPROVED BY:

A5Md-ECSP MANAGER 4/i/61 DATE NA MANAGER OF NUCLEAR POWER DATE 8704130017 870406 CONCURRENCE (FINAL REPORT ONLY)

PDR ADOCK 05000327 P PDR

• SRP Secretary's signature denotes SRP concurrences are in files.

~

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f TVA EMPLOYEE CONCERNS REPORT NUMBER: C010505-SQN 1

"'c SPECIAL PROGRAN REVISION NUMBER: 3 PAGE 2 0F 4 I. Irtroduction- l i

A4 evaluation of concern OW-85-007-010 and IN-85-685-002 was conducted. l ,

Ihese concerns were associated with the contamination of control IR3 cabinets from a heavy buildup of dust and metal trindings. ~l II. Summary of Perceived Problem The concerned individual apparently felt that the electrical control cabinets were contaminated by excessive dust and metal grindings, were i .- not being properly protected nor cleaned, and the dust would adversely affect plant operation by causing contactors and other electrical components to blow out or become inoperative.

7-I' III. Evaluation Methodology A. Reviewed WBN Element Report Electrical Control Cabinets (C010505),

i to determine applicability to SQN.

B. Walkdown tours were performed in the Auxiliary, Turbine and Control Buildings observing internal and external portions of electrical a

cabinets for dust and metal grindings.

(

C. Reviewed Standard Practice SQA66, Plant Housekeeping, Revision 9.

l D. Interviewed knowledgable electrical maintenance personnel, both  :

craftsmen and engineers, in regard-to dust and metal grindings building up on or inside electrical control cabinets.

l E. Reviewed the Maintenance Request (MR's) related to the repair of l electrical control cabinets to determine if dust and/or metal grinding contamination had caused problems.

IV. Summary of Findings A. The review of WBN Element Report, Electrical Control Cabinets (C010505) revealed WBN did not have a problem at present with dust

or metal grindings building up on or inside electrical cabinets.

l The generic application to SQN was in regard to the need for employee involvement in reporting deterioration and any lack of cleanliness conditions, i,

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• TVA EMPLOYEE CONCERNS REPORT NUMBER: C010505-SQN SPECIAL PROGRAM REVISION NUMBER: 3 PAGE 3 0F 4 B. A walkdown tour was made of electrical control cabinets in the Turbine, Auxiliary, and Control Buildings. Some dust was found on the outside of some of the cabinets. No metal grindings were observed. No dust or metal grindings were observed inside the cabinets. The amount of dust observed was minor and was not enough to be detrimental to cabinet functions.

C. Review of Standard Practice SQA66, Plant Housekeeping, Revision 9, revealed in paragraphs 4.0.6 and 4.0.7 that plant operations personnel will clean the front of electrical distribution boards, control boards, and control panels. In general, everyone engaged in a work activity is responsible for maintaining proper cleanliness during the activity and for cleanup following completion of the activity.

Also, in paragraph 4.2, Sections E and F, this procedure states "special care shall be taken when opening or disassembling sensitive electrical equipment which may be damaged by dust or moisture. Such work shall be performed in an area which has been cleaned of excess litter, dirt, and dust." " Barriers, screens, shields, restricted access, or other protection shall be provided as necessary for isolation of areas where dust, inclement weather, or other conditions exist that may affect the quality of work being performed." The housekeeping checklist also has specific electrical check items such as "there is no accumulation of foreign materials around the exterior of electrical boards and panels."

D. Interviews with knowledgeable electrical maintenance personnel revealed they do not feel dust and metal grindings on or inside the electrical control cabinets to be a problem. The interviews revealed the electrical maintenance personnel were very much aware of the need for cleanliness of these cabinets.

E. Review of the Maintenace Requests (MR's) did not reveal any direct evidence that dust or metal grindings in control cabinets having caused a problem. However, the MR's are not written in such a manner that would necessarily indicate what specifically necessitated the repairs. The MR review findings, coupled with the interviews and other evaluations indicated there has not been a problem with dust and/or metal grindints contaminating the control cabinets at SQN.

Conclusion There is not a problem with dust and metal grindings contaminating the control cabinets at SQN. There are procedures in place at SQN to prevent this from becoming a problem.

," TVA EMPLOYEE CONCERNS REPORT NUMBER: C010505-SQN SPECIAL PROGRAM REVISION NUMBER: 3 PAGE 4 0F 4 V. Root Cause Not a problem at SQN; therefore, no root cause exists.

VI. Corrective Action No Corrective Action Required VII. Generic Applicability i

None VIII. Attachments Attachment A - Listing of concerns indicating safety relationship and generic applicability.

TVA EMPLOYEE CONCERNS REPORT NUMBER: C010505-SQN SPECIAL PROGRAM REVISION NUMBER: 3 PAGE 1 0F 1 Attachment A OW-85-007-01001 CO 10500 N WBN 1Y Y Y Y ELECTRICAL CONTROL CABINETS T50225 2 SR SR SR SR HAVE BEEN CONTAMINATED BY CONSTRUCTION DIRT AND METAL GRINDINGS. THIS CONTAMINATION ENTERED THE PANELS THROUGH THE COOLING VENTS ON THE TOPS OF THE PANELS. THIS IS A PLANTWIDE PROBLEM, BECAUSE OF THE HEAVY BUILD-UPS OF DUST AND METAL PARTICLES THAT HAVE BEEN ALLOWED TO ACCUMULATE ON TOP OF EQUIPMENT. THIS COULD CAUSE THE CONTACTORS OR OTHER COMPONENTS TO DETERIORATE AND BLOW OUT OR BECOME INOPERATIVE. A SPECIFIC LOCATION GIVEN IS AUX. BLDG, 757' EL UNIT NOT KNOWN.

IN-85-685-00201 CO 10500 N WBN 1Y Y Y Y ACCUMULATIONS OF DIRT AND T50068 2 SR SR SR SR DUST IN VITAL CONTROL CABINETS. NO FURTHER DETAILS AVAILABLE. NO FOLLOW-UP REQUIRED.

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