ML19347C801

AO 50-219/74/3:on 740113,during Insp of Bergen-Paterson HSSA-10 Units in Primary Containment Hydraulic Shock & Sway Arrestors Found Devoid of Fluid.Cause Under Study.Units Replaced W/Units Rebuilt W/Ethylene Propylene Seal Matl

ML19347C801
Person / Time
Site:	Oyster Creek
Issue date:	01/24/1974
From:	JERSEY CENTRAL POWER & LIGHT CO.
To:
References
AO-50-219-74-3, NUDOCS 8103040590
Download: ML19347C801 (2)

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Abnormal Occurrence Report No. S0-219/74/3 Report Date:

January 24, 1974 Occurrence Date:

January 13, 1974 Identification of Occurrence:

Failure of Hydraulic Shock and Sway Arrestors on one Core Spray System and on both Isolation Condenser Systems. This event is considered to be an abnormal occurrence as defined in the Technical Specifications, paragraph 1.15D.

• Conditions Prior to Occurrence:

The plant.was in a cold shutdown condition with reactor coolant at <212*F.

Description of Occurrence:

During the required inspection of the Bergen Paterson HSSA-10 units in the primary containmi.nt, five units were discovered t o De devoid of fluid.

They were located as follows:

3 "A" Isolation Condenser 1 "B" Isolation Condenser 1 - Core Spray System No. 2 Apparent Cause of Occurrence:

The cause of snubber inoperability was due to a loss of hydraulic fluid.

Disassembly of each of the inoperable snubbers has revealed no visually obvious deterioration of the seal material except for some brittleness.

Analysis of Occurrence: '

The ssfety significance of this occurrence was a partial loss of the seisnic restraining ability for the two affected systems. Had the plant suffered a design bases carthquake, the probability that these two systems would have suffered structural damage was increased.

Corrective Action:

I The failed unitt were replaced with units that were rebuilt with ethylene propylene (Park- 3rade E6S2-90) seal materi,al. Four of the inoperable 7/O30YD590

.. o. (+ 1 Abnormal Occurrence Report No.. 50-219/74/3 Page 2 units were located above the biological shield, a relatively hot area in' the containment, and had been rebuilt in September 1973 with molded polyurethane and viton type seal material. All of the units in that area, regardless of condition, have been replaced with units rebuilt with the ethylene propylene type mar.erial.

Failure Data:

Manufacturer: Bergen Paterson Type: HSSA-10 Serial Nos.: 487517 487487 477376 470924 469962 l