ML20006A872

LER 89-009-01:on 890413,temporary Protection Covers Found on Five Temp Elements During Test of High Energy Line Break Temp Elements.Caused by Deficiency in Surveillance Program. Covers Immediately Removed from Temp elements.W/900123 Ltr

ML20006A872
Person / Time
Site:	Beaver Valley
Issue date:	01/23/1990
From:	Noonan T DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-89-009, LER-89-9, ND3MNO:1994, NUDOCS 9001300398
Download: ML20006A872 (5)

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1 January 23, 1990 l ND3MNO:1994 i

i Beaver Valley Power Station,' Unit No. 2 Docket No. 50-412, License No. NPF-73 LER 89-009-01 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:

In accordance with Appendix A, Beaver Valley Technical Specifications, the following revised Licensee Event Report is submitted:

LER 89-009-01, 10 CFR 50.73.a.2.ii.B, " Degraded High Energy Line Break (HELB) Temperature Elenients".

T. P. Noonan General Manager Nuclear Operations

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9001300398 900123

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cc: Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Commission ,

Region 1 475 Allendale Road King of Prussia, PA 19406 C. A. Roteck, Ohio Edison Mr. Peter Tam, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, DC 20555 J. Beall, Nuclear Regulatory Commission, BVPS Senior Resident Inspector CAPCO Nuclear Projects Coordinator

. Toledo Edison INPO Records Center Suite-1500 1100 Circle 75 Parkway Atlanta, GA 30339 G. E. Muckle, Factory Mutual Engineering, Pittsburgh Mr. J. N. Steinmetz, Operating Plant Projects Manager Mid Atlantic Area Westinghouse Electric Corporation Energy Systems Service Division l Box 355 l Pittsburgh, PA 15230 American Nuclear Insurers e/o Dottie Sherman, ANI Library The Exchange Suite 245 270 Farmington Avenue Farmington, CT 06032 Mr. Richard Janati Department of Environmental Resources P. O. Box 2063 16th Floor, Fulton Building Harrisburg, PA 17120 ,

Director, Safety Evaluation & Control Virginia Electric & Power Co.

P.O. Box 26666 One James River Plaza Richmond, VA 23261 l

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. C Form ame U s. NUCLEf2 LE1ULATORY COMMIS$10N t.PXOVED O'it 8'O 31E0-01o4 LICENSEE EVENT REPORT (LER) Emau 8""

Fl.CILITY NAME tu DOCEET NUMBER (2i PA6I (3i

Beaver Valley Power Station. Unit 2 0 l5 t o 1010141112 1lOFl013 i flILE tel ,

l Degraded High Energy Line Break (HELB) Temperature Elements EVENT DATE t$1 LIR NUM8ER (6) REPORT DATE 471 OTHER F ACILITit$ INVOLVED tai MONTH DAY YEAR YEAR 8

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On Testing 4/13 /89, with the Unit in Refueling (Operating Mode 6),

and Plant Performance personnel were performing a surveillance procedure to check- the response of temperature sensors (elements)e The temperature sensors are located in the Cable Vault, "A" Penetrations and Primary Auxiliary Building areas. They provide protection in the event of a High Energy l

Line Break (HELB) by causing automatic. isolation of the steam generator blowdown and auxiliary steam lines in those areas.

During the performance of this test, cardboard covers and temporary protection covers were found on five of twenty-two temperature elements. These covers were removed to allow testing of the temperature elements. The temperature elements were left exposed followincJ the completion of testing. The cause for this event was attributed to a deficiency in the surveillance program. The temporary covers were left on after acceptance testing to protect the elements during additional construction i activities. The covers affected the response time for the elements, because of the limited area of the element exposed to sense temperaturee An analysis was performed to determine the amount of degradation in response time. This analysis showed that the delay in system response for blowdown line and auxiliary steam breaks did not result in equipment damage or exceeding the peak qualification temperature for the areas.

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N:ce . assa u s. NUCLE AR FEGULt. TOM COMMISSION l

• I" LICENSEE EVENT REPORT (LER) TEXT CONTINUATION APPaovio ous No. mo-oio4 .l

, EXPIRES: $!31/98 ' {

F ACILITY NAME (H DOCKET NUMSER (2P LE R NUMSE R (6) PAGE (31 vs'a "OtWe' 7J'.T*

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TLxt (W more space h sequwed, une eeurtenet NMC form JE6AM (1h DESCRIPTION On 4/13/89, with the Unit in Refueling (Operating Mode 6), Testing and Plant Performance personnel were performing Beaver Valley Test (BVT), 2BVT 1.60.7, "High Energy Line Break (HELB) Temperature Detection System Operability Verification." This surveillanceL procedure checks- the response of the- twenty-two (22) temperature l elements and temperature switches associated with each : element. l These temperature elements are located in the Cable Vault and Rod q Control Area (pipe tunnel elevation - 718 feet 6 inches) and in the Primary Auxiliary Building (elevation - 755 feet). The elements i provide protection in the event of a HELB by sensing the area I temperature rise and causing automatic isolation of the esteam i generator blowdown and auxiliary steam system lines in those areas.  ;

During the performance of'2BVT 1.60.7, cardboard covers and temporary protection covers were found on five (5) temperature elements (2BDG-TE101A1, 101B1, 101B2 and 2 ASS-TE-116A, 116B]. .These covers were immediately removed and testing was satisfactorily completed.

CAUSE OF THE EVENT The cause for this event was attributed to a deficiency in the surveillance program with regards to inspections of the temperature elements. The covers were initially placed over the temperature elements, as part of a good worker practice, to protect the elements #

from the- construction activities in the areas. Initial testing of l

the temperature elements was completed in March 1986, prior to the I completion of construction activities in the areas. Following completion of these activities the covers were never removed from the temperature elements. This was not identified during other i surveillance testing (continuity and setpoint testing) because the i testing is performed at the temperature switches and not the i temperature elements. This is considered an-isolated case.

CORRECTIVE ACTIONS

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l The cardboard covers and the temporary protection covers were immediately removed from the temperature elements. The station is implementing a periodic visual surveillance of the temperature -1 elements. I REPORTABILITY '

This written report is submitted in accordance with 10CFR50.73.a.2.ii.B, as a condition that potentially exceeded the design basis of the plant.

R FORM 364A 'U.S. GPos 1988-520*Sa9r00010

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, LICENSEE EVENT REPORT (LER) TEXT CONTINUATION mRono oes no mo-oio4 j . EXPIRES. S'31/WL PJ.CILITY NAME (13 DOCKB T NUMBER (2) g g

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0l1 0 l3 OF Ql3 SAFETY IMPLICATIONS The covers affected the response times for the elements because of the limited surface area exposed to sense a temperature rise. This.

reduced the capability to respond to a High Energy Line Break in the applicable areas. Redundant uncovered temperature elements in the Cable -Vault and Rod Control Areas were available to provide protection in the event of a HELB. An analysis has been performed to determine the amount of ' element response degradation due to the placement of the temporary covers. The results of this analysis showed- that the system response for Steam Generator Blowdown line breaks is not delayed significantly due to tripping of sensors in adjacent areas. The results of the analysis for the Primary  ;

Auxiliary Building Auxiliary Steam line breaks showed the sensor-response delayed by approximately 300 seconds. However, the peak qualification temperature for the area is not exceeded .and no equipment would be affected.

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