ML19308D437
| ML19308D437 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 08/11/1977 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19308D420 | List: |
| References | |
| NUDOCS 8002280751 | |
| Download: ML19308D437 (2) | |
Text
. - s LICENSEE EVENT REPORT,
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LCENSE NUMDER TYPE L/l F l L l C l Rl P l 3 l l0l0I-l0l0l0l0l0l-l0l0l l 4l 1l1l1l1l l0l3l 7 89 14 15 25 26 30 31 32 rYpe SNN CATEcoRY coCxET NUM0ER EVENT DATE REPORT oATE O 1 CON'T l - l - l W
l0l5l0l-l0l3l0l2l l Ol 7 l1l 7 l7 l7 l l0 l8 l1 l1l7l7l 7 8 57 b6 59 60 G1 68 69 74 75 00 EVENT OESCRIPTION l Following a unit trip, the Steam Driven Emergency Feedwater Pump (EFP-2) experienced an Oe g
7 89 gg g l overspeed trip upon ah autostart. Redundant pump (motor-driven EFP-1) was started and g
7 89 UO g f, l utilized. This was a repetitive occurrence. The trip was reset immediately. The pudp 7 89 UO O5 l was re-started and 'run in the recirculation mode.
(LER 77-92) l 7 U9 60 l
7 09 psuus 50 C E CODE COMPONENT CCCE M
A A
VOLATCN O
lHlHl d lTlUlRlBlIlNl lAl l Tl 1l 7 l 4 l l Nl 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION
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0o l Condensation in steam supply prevented throttle valve from closing fast enough to prevent l
e' 7 89 ag l overspeed trip on initial start. The modified drain system plus a steam by-pass around the 7 89 R inlet valve that was completed on 5 August 1977,have demonstrated operability to this date.6 ST 3
% POWER oTHER STATUS otSCoVERY DISCOVERY CESCRIPTCN y
l0 l0 l0 l l_
NA l
l Al l
NA l
t1 78 9
10 12 13 44 45 46 60 ACTMYY CodTENT DELEASto of RELEASE l AMOUNT OF ACTMTV LoCATON of RELE SE
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NA l
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7 8 9
10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCR!PTCN
@ l0 1 0l 0l Wl NA i
l 7 89 11 12 13 60 '
PERSONNEL INJuniES NUMGER oESC5b? TON
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NA l
7 8D 11 12 80 l
OFFSITE CONSEQUENCES
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7 80 80 LOSS OR DAMAGE TO FACIUTY TYPE CESCTEPTCN
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7 89 10 GO PUBLICITY
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7 80 00 8002280 7 6[
^ODITIONAL TACTO"3 l
See attached Supolementarv Information j
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NAME:
T. P. Seew1rt PHONE: (813) R66-4159 CPO _ARI.e.C7
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SUPPLEMENTARY INFORMATION 50-302/77-92 port No.:
2.
Facili'ty:
Crystal River Unit #3 3.
Report Date:
11 August 1977
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4.
Occurrence Date:
17 July 1977 5.
Identification of Occurrence:
Failure of the Steam Driven Emergency Feedwater Pump (EFP-2) to autostart on mainsteam supply lineup contrary to Technical Specification 3.7.1.2(b) which requires two emergency feedwater pumps available and operable from two independent power sources.
6.
Conditions Prior to Occurrence:
Mode 3 following a unit trip.
7.
Description of Occurrence:
At 0407, following a unit trip, the main feedwater pumps were lost upon the transfer of buses. The Steam Driven Emergency Feedwater Pump (EFP-2) autostarted and tripped on
/;
overspeed. The Motor Driven Emergency Feedwater Pump (EFP-1) was immediately started and the trip on EFP-2 was reset and the pump restarted.
It has been demonstrated that EFP-2 will start on the second attempt.
Short-term Instructions77-053 and 77-060 were issued to require daily testing of EFP-2 and requiring that an operator be stationed at the pump on a 24 hour-a-day basis, in order to operate EFP-2 if, and when, it is (n) required. A 15 minute steam line blowdown was accomplished every two hours and a reques
%,r for additional Engineering evaluation was submitted on 20 July 1977. Subsequently, EFP-2 experienced first stat: overspeed trips on 22, 23, 25 July, and 1 August 1977. Upon each occasion the trip was reset and EFP-2 was run either in the recirculation mode or opera-tionally tested by the operator stationed at the pump. Engineering evaluations were in progress during this time frame, and in addition to the previous modification to the drain system, a by-pass line around the steam inlet isolation valve ASV-5 was installed on 5 August 1977 to prevent condensate buildup. The Steam Driven Emergency Feedwater Pump has demonstrated operability to this date.
8.
Designation of Apparent Cause:
The cause of this and subsequent events was determined to be condensation buildup in the steam inlet lines.
9.
Analysis of Occurrence:
There is no safety hazard to the plant or public inasmuch as the redundant motor-driven Emergency Feedwater Pump has been available and operable, and EFP-2 has been in operable I
status, either running in the recire mode or manually.
10.
Corrective Action:
To assure the prevention of condensation accumulation in the steam supply line upstream of the throttle valve, the drain system had been modified to tasure the drain capacity and a by-pass line was installed around ASV-5 to prevent condensate buildup.
O 1
'ailure Data:
N.j This occurrence is repetitive as reported by LER's 77-24, 77-37, and 77-56.
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