ML19329E323
| ML19329E323 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities, Midland  |
| Issue date: | 04/01/1976 |
| From: | Kalivianakis N CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19329E317 | List: |
| References | |
| NJK-76-118, NUDOCS 8006120631 | |
| Download: ML19329E323 (5) | |
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Cuadova. tumens M N2 rcreptionea w/us.2241 NJK-76-118 April 1, 1976 J. Keppler, Regional Director Office of Inspection and Enforcement Regl,on iIi U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, II1Inois 60137
Reference:
quad-Citics Nuclear Power Station Docket No. 50-265, DPR-30, Unit 2.
, in response to your inspection Report No. 050-265/76'-04, the folicwing
' report concerning possibic generic problems related to Electro-Hydraulic
- Control (EHC) system oil migrating to the cable tunnel area is being submitted.
On' october 9,1975, station personnel were cleaning up EHC fluid which only had th,e, ping on the Unit 2 cable tunnel had been drip floor.
It was noticed not EltC fluid been leaking onto the ficor but also it had been leaking onto the cables in the surrounding cable pans.
Closer inspection of the cables revealed puf fing and plastici2ation of cables that the EllC fluid had made contact with.
At the time of discovery, Unit 2 was in the cold shutdown condition.
Cabics in the Unit 2 cabic tunnel were utilized for both safety related and non-safety related functions.
The EllC fluid leak had not rendered any safety or non-safety related systems inoperabic.
The Irnmediate action taken was to determine the extent of plasticization of the af fected cabics.
All the cables and cable pans in the affected
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area of the Unit 2 cable tunnel were cleaned with a soap and water solution as recorrmended by information f rom the EliC fluid manufacturer.
The cicaning of Clic fluid from the cables shonald climinate further ef fects of plas-ticization.
A small section of control cable, which was hand traced to identify its function, was cut out and analyzed.
it was discovered that only the overall Jacketing material had been af fected by the EllC fluid.
Varlous cable marsufacturers and the manufacturer of EllC fluid were consulted as to the ef fects of filt fluid on various polymers used for cabic.
Poly-vinylchloride (l'VC) and ncoprene were found to be af fected severely by CHC fluid and not recor.vacnded for use around CHC fluid.
Other polymers such a, polyethylene, teflon. siliconc rubber, nylon, and hutyl rubber were acc.cptable for u:,c around CitC fluid.
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, L The rough slab' serves as the ceiling in the Unit 2 cabic tunnel and clnor small cracks in the ceiling served as.i lonk path out of the concrete and onto the cable trays and floor.
Portions of cables within these trays tiius became saturated with the EllC fluid.
Tic upper cable trays did not contain al1 of the titC fluid, even though the pans in the cable tunnel were of solid bot rom construction.
This was because the EllC flui,d had Icaked through the cable pan connecting joints cnd thus all the cabic pans below were subje.ted to the EllC fluid.
The esbles closest to the bottom of the cable p.ms were most affected by the EHC fluid because these cabIcs were in const. int saturation with EHC fluid.
At the prc'sent time, all the cables in the affected' area of the Unit 2 cable tunnel are being protected from the continuing EllC fluid leakage.
The leakage has subsided and once it has stopped the ceiling area will be cleaned and a protective sealer will be appi'. <l to prevent any possible Isakages.
The EHC fluid reservoir foundatior must also be scaled with the same protective sealer once leakages have been resolved.
The. sealer has been erdered from the Carboline Company, type 107 IIFP,.which is a recommended EHC fluid sealant.
s The station's technical staff has been performi.ng a weekiy inspection of the Unit 2 cable tunnel to assure that thern is 'no leaking onto the cables.
A repres'entative from the Region lit, U. S. Nuclear Regulatory. Commission raviewed the work package associated with the repairs and discussed his findings with the station.
If-further information is desired, please contact the station.
Sincere 1'y yours,
< k f
r-t H. J. Ka11vianskis Statlon Superintendent
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Quad-Cities Nuclear Power Station NJK/LLH/lk S
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t FIGURE I UNIT 2 CAOLE TUNNEL PARTI AL PL AN UNIT 2 EHC OIL RESERVOIR (ELEV. 595')
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