ML19323G400

LER 80-026/03L-0:on 800422,pump Being Used to Start Liquid Waste Discharge Observed to Have Higher than Normal Flow. Caused by Leaking Effluent Valves.Corrective Actions Scheduled to Be Completed as Soon as Possible

ML19323G400
Person / Time
Site:	Beaver Valley
Issue date:	05/21/1980
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19323G398	List: ML19323G397 ML19323G400
References
LER-80-026-03L, LER-80-26-3L, NUDOCS 8006020362
Download: ML19323G400 (4)

Text

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RRC FFM 364

• U. S. NUCLEAR RECULAToRY COMMISSION (7 776 .

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REPORT DATE 7 8 60 68 00CKET NUMSER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

[7"ITI lOn April 22, 1980 at 0130 hours0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-5 months <br />, it was noticed by plant operators that the pump l 0 3 lbeing used to start a liquid waste discharge had a higher than normal flow. Further l the l g linvestigation showed that a liquid waste stop valve was misaligned and that 10151 leffluent valves leaked by. Tank activities sere checked and found to be well within l ITTs l Idischarce specifications. There were minimal implications to the health and safety l

[O""TTI lof the public due to this unplanned discharge since no discharge limits were [

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35 37 40 A4 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h .

lilOglThe root cause of this incident is attributed to leaking effluent valves, not to l t i Ivalve misalignment. The valves have been checked and a valve operator trim I

, 7 l adjustment was necessary on one and the other valve needs machined. All corrective I l

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DUQUESNE LIGHT COMPANY Beaver Valley Power Station May 21, 1980 Unplanned Liquid Waste Release The unplanned release that occurred between April 16 and April 22, 1980 has been investigated and is summarized in the following chronological sequence of events. ,

April 16, 1980 At 0228 hours0.00264 days <br />0.0633 hours <br />3.769841e-4 weeks <br />8.6754e-5 months <br />, Liquid Waste Permit No. 1267 for Liquid Waste Tank

[LW-TK-5B] was lined up for discharge and started. At this time, a communications mix-up occurred between the NCO and the Auxiliary Building NO and valve [LW-17] was opened.

When the discharge was started, the discharge flow control valve and trip valve-both closed due to a trip (high) on Liquid Waste Radiation Monitor [RM-LW-104).

The NCO sent the Auxiliary Bu,ilding NO to flush the monitor and reset

, the alarms. Before the NO returned to the Control Room, the background on

[RM-LW-104] had drifted back up to the high alarm level. At this time, the NSS told the operator to void Discharge Permit No. 1267 and resample the tank.

After the preceeding sequence of events, the recorder pen on [FR-LW-104]

never returned to zero. Instead, the pen read out at 2.5 gpm on the high range scale (0-50 gpm). The NCO noticed the change on the flow recorder and secured the test tank pump and discharge MOV from this tank. This had no effect on the recorder tracing.

The NCO believed he had completely secured the discharge from the test tank and that the recorder was in error.

It was known prior to this incident that valves [MOV-LW-ll2A, 112B]

(the discharge valves to Steam Generator Drains Tanks [LW-TK-7A, 7B]) leaked by. This had been found out several days prior to the incident. With the combination of_the leaky valves and valve [lLW-17] being open, the liquid waste discharge header is pressurized to the flow control valves and trip valve which are also now known to leak.

6-~ * . m e- e

April 16 to April 22, 1980 Unplanned Liquid Waste Release (continued)

April 17, 1980 From 0400 to 0600 hours0.00694 days <br />0.167 hours <br />9.920635e-4 weeks <br />2.283e-4 months <br />, liquid waste was transferred from the Steam Generator Drains Tanks [LW-TK-7A, 7B] to the High Level Liquid Waste Tanks

[LW-TK-2A, 2B].

Referenef 4 Nuclear Operator Log L3-5, the level in [LW-TK-7A, 7B]

decreased two _ eat, from 3.5 to 1.5 feet, between 0410 and 0615 hours0.00712 days <br />0.171 hours <br />0.00102 weeks <br />2.340075e-4 months <br />.

From 0800 to 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br />,,because of the incident with Discharge Permit No. 1267 and previous problems, the Instrument & Control group was performing maintenance on [RM-LW-104]. The technicians removed the [RM-LW-104] detector by manually isolating the discharge flow path for 4.66 hours7.638889e-4 days <br />0.0183 hours <br />1.09127e-4 weeks <br />2.5113e-5 months <br />. There was a noticeable flow decrease to zero flow on ,[FR-LW-104] at this time.

At 1802 hours0.0209 days <br />0.501 hours <br />0.00298 weeks <br />6.85661e-4 months <br />, when the technicians finished their job, Radeon personnel signed on Equipment Clearance Permit No. 390397 to perform a calibration check.

April 18, 1980 At 2230 hours0.0258 days <br />0.619 hours <br />0.00369 weeks <br />8.48515e-4 months <br />, Steam Generator Drains Tank [Lh-TK-7A] was placed on recirculation through Ion Exchanger [LW-I-1] for cleanup. At this time, it was felt that water from [LW-TK-7A] was leaking into (LW-TK-7B].

April 19, 1980 From 0000 to 2400 hours0.0278 days <br />0.667 hours <br />0.00397 weeks <br />9.132e-4 months <br />, the Instrument & Control group removed Radiation Monitor [RM-LW-104] from service for 1.66 hours7.638889e-4 days <br />0.0183 hours <br />1.09127e-4 weeks <br />2.5113e-5 months <br />. Flow again went to zero on

[FR-LW-104]. . .

April 20, 1980 ,

a At 0825 hours0.00955 days <br />0.229 hours <br />0.00136 weeks <br />3.139125e-4 months <br />, Radeon signed off electrical clearance No. 390397 on

[RM-LW-104). (This was the clearance for calibration that was hung on April 17th at 1802 hours0.0209 days <br />0.501 hours <br />0.00298 weeks <br />6.85661e-4 months <br />.)

April 21, 1980 At 1715 hours0.0198 days <br />0.476 hours <br />0.00284 weeks <br />6.525575e-4 months <br />, Radcon signed on Equipment Clearance No. 413257 and signed off the clearance at 1820 hours0.0211 days <br />0.506 hours <br />0.00301 weeks <br />6.9251e-4 months <br />. They did not manually isolate the detector at this time.

l

April 16 to April 22, 1980 Unplanned Liquid Waste Release (continued)

April 22, 1980 At 0130 hours0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-5 months <br />, the first attempt since April 16 was made for a radwaste discharge using Liquid Waste Permit No. 1270. When the discharge of Liquid Waste Test Tank [LW-TK-5A] was started, it was stopped shortly thereafter because the operator noticed the high flow rate for tb7 pumps being used.

When the discharge was started the second time (after checking the flow diagrams), the discharge flow and the tank level decrease did not match.

At this time, another operator went out and manually rechecked the valve lineup. He found valve [LW-17] (inlet to the Liquid Waste filters to the discharge FCVs) open and he closed it. The plant operators determined at this time that this was the source of the.ir inleakage. The discharge permit for [LW-TK-5A] was restarted and completed.

At 0309 hours0.00358 days <br />0.0858 hours <br />5.109127e-4 weeks <br />1.175745e-4 months <br />, Discharge Permit No. 1271 for Test Tank [LW-TK-5B]

was started and was completed at 0417 hours0.00483 days <br />0.116 hours <br />6.894841e-4 weeks <br />1.586685e-4 months <br />.

The total discharge time from start to finish of the incident, taking into account the time that maintenance had the detector isolated, was 137.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.

Using the Liquid Waste Tank levels logged on Station logs L3-5 on April 16 through 21, with comparison to the NCO's logs.S-4, S-5 and S-6 for the period April 16 to 21, it is our conclusion that no more than 4,250 gallons of liquid waste could have inadvertently been discharged in the aforementioned

, time period.

It is also our conclusion that tank levels give a more accurate indication overall of liquid lost than is indicated by a flow transmitter, due to inaccuracies ,

of the square root extractor at low flow. '

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