ML19261D532
| ML19261D532 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 06/07/1979 |
| From: | Manry M GEORGIA POWER CO. |
| To: | |
| References | |
| NUDOCS 7906190436 | |
| Download: ML19261D532 (3) | |
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01 04XLEY, GECRGIA 31513 f
Pl'S l'A. JAt45 P. O'RF ILLY UNITED 514TES HUCLE AR RLGt'L4RTJRY C0mlSS1011 A ufs DlHEli(R OF lHSPECTION AGD EUTORCEf'.Elli gf
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ATLA 4TA, GEORGIA 30303 J
H4TCH UNIT 2. DDCKET HD. 50-356 HDTIFICATION OF REPORTAB
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EHCE SLD)ECT:
NO. 50-35f/1979-45, Rgy. 1 L
NOTIFILD: Ross F. Rogers
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DATE: 6/7/79 DATE: 6/4/79 q
TIME: 3:30 PM i
f CESCRIPTION OF REPORTACLE OCCURRENCE
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Initial Condition:
During reactor power ascension, at 2387 mega watts thermal, a reactor scram The reactor power i,
occurred at 1850 CDT due to a condensate system trip.
7, level fell below 1300 counts per second.
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Nature of Occurrence:
Dae to the low level in the reactor at 1855 COT. the HPCI System was required
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to initiate and pump water to the vessel. ' Although the HPCI received an initiation signal. it did not start because the turbine stop valve f ailed to 5
open.
Irredia te Correcti.ve,f,c tion _:
5 The HPCI was secured and the rtquirements of Technical Specifications 3.5.1 The vessel level was maintained by restoring the condensate co nplied with.
system to operability.
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Cause:
One of the HPCI pump mechanical seal cooling injection water If nes wasThis leak drained to r
leaking at the threaded connection at the pump casing.The bracket drain cavity drain I
the bracket drain cavity.
This valve was closed thus allowing installed for reasons presently unknown.
the Icak to fill the bracket drain cavity to a point above the shaf t. The adjacent bearing housing does not have a liquid tight seal by design (not This allowd water to enter the bearing housing from the flooded r
requi red ).
Had the This water then drained to the oil system.
bracket drain cavity.
bracket drain line valve not been closed the leak would not have affected the The bracket drain line valve was not listed operat ion of the HPCI in any way.
in the system velve lineup procedure nor was it shown on the system P&lD.
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r RO Telenram Cont'd
. June 7,'1979
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u S,upp.lemental Correc tive Action:
4.
The reactor was brought to the hot shutdown condition.
b.
The leaking seal injection line was repaired by replacing a section of i-the leaking line.
The oli system was drained, flushed and refilled twice.
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c.
I d.
An investigation of the oil system was made to deterTnine if there were
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any other ways for water to enter the system. The oil cooler in the system was identified as being a possibility but pressure test proved the
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coaler to be good. flo other possible water sources were identified.
e.
The turbine bearings were inspected for possible danuge. The inspection I,
revealed a "1D.e new" condition.
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The volves in the bracket drein lines will be locked open prior to startup 5.
and a study initiated to deterrnine if the valves could be remsved from the F
lines.
In the interim this valve has been added to the systen valve lineup procedure.
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A study has been initiated to select a nethod whereby water in the oil 4-systems of RCIC and llPCI turbines may be readily identified.
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Until the above study is completed the oil systers on the HPC! turbine r
will be sarnpled on a weekly basis.
1.
A study has been initiated to detemine if the seal injection lines L
need additional support to help prevent future leaks.
i Status of Redundan.t.or Backup Syste_ms.;,
f The RCIC failed to operate but the Automtic Depressurization Systes, Core Spray System and 1.ow Pressure Coolant Injection System were operable.
Inpset To_,0.th,er Uni t:
A lack of a water detection in the turbine oil system may be a problem
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a.
with other stcam-driven pumps.
E b.
An investigation was made on Unit 2 RCIC system and Unit 1 HPCI and RCIC Systems to determine if the same valves exist in the cavity drain lines.
h The results are as follows:
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- 1. ' Unit 2 RCIC - tio drain line.
The cavity drain hold is open snd 1
will drip to the pump skid.
5 Unit I flPCI - Drain line to floor drain with no valve installed.
Unit 1 RCIC - flo drain line. The cavity drain hole is open and t
will drip to the pamp skid, t.
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RO Telegram Cont'd June 7, 1979 L
E JuJtification For C,0n_t.inued Operation:
i flo detectable msisture was g
The llPCI system oil was analyzed for water.
The stop and control valves were cycled to insure proper operation.
present.
An operability test will be perfomed as soon as reactor Conditions pernit.
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