ML20215F036
| ML20215F036 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 09/29/1986 |
| From: | Morgan R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| RNPD-86-4554, NUDOCS 8610160058 | |
| Download: ML20215F036 (2) | |
Text
pmb CP&L Carolina Power & Light Company US DCT 9 A8:al ROBINSON NUCLEAR PROJECT DEPARTMENT POST OFFICE BOX 790 HARTSVILLE, SOUTH CAROLINA 29550 SEP2 9 1986 Robinson File No:
13510C serial: RNPD/86-4554 Dr. J. N. Grace Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30323 H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET No., 50-261 LICENSE NO. DPR-23 30 DAY SPECIAL REPORT - PORV ACTUATION
Dear Dr. Grace:
This special report on the actuation of a Pressurizer Power Operated Relief Valve while in cold shutdown is submitted pursuant to Technical Specifications 3.1.2.1.e and 6.9.3.1.e.
EVENT DESCRIPTION:
On September 2, 1986, while Unit 2 was in cold shutdown, a Pressurizer Power Operated Relief Valve (PORV) lifted twice to prevent overpressurization.
The Reactor Coolant System (RCS) was in a water-solid condition pressurized to approximately 350 psig, and unit operators were in the process of starting the Reactor Coolant Pumps to begin unit heatup.
CAUSE:
The actuation of the PORV was the result of inadvertent action by unit operators. An Auxiliary Operator (AO) had locally racked in the "A" Charging Pump breaker to return it to service. The breaker trip spring displayed "DISCHARCED" and the A0 erroneously assumed the breaker spring needed
)
" charging." The A0 then pushed the local " CLOSED" button thinking this action would " charge" the trip spring. However, this action closed the breaker resulting in a second Charging Pump running. Control Room personnel were initially unaware that the second pump had been started locally.
8610160058 860929
- o PDR ADOCK 0500 1
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Lettsr to Dr. J. N. Creca S2ric18 RNPD/86-4554 Page 2 The running of "A" Charging Pump created an increasing pressure condition with the RCS water-solid. The Control Operator was in the process of adjusting charging flow from "C" Charging Pump to establish Reactor Coolant Pump seal flow; therefore, some RCS pressure changes were expected. However, the Pressurizer PORV lifted twice to reduce RCS pressure before the Control Operator could stop "A" Charging Pump and stabilize pressure.
CORRECTIVE ACTION:
Operations personnel involved have been reminded of the importance of understanding breaker position indicetors and of the impact of inadvertent Charging Pump operation when water-solid. An assessment is being made by th.
Unit 2 Operations staff of the need for additional training / retraining on local operation of breakers. Additional guidance will be provided as appropriate for inclusion in the Operator training / retraining programs.
If you should have any questions concerning this report, please contact Mr. J. M. Curley at 803-383-4524, extension 2367.
i Very truly yours, R. E. Mgan General Manager H. B. Robinson S. E. Plant DAS:leh cc:
J. N. Grace (3 copies)
R. A. Hartfield (3 copies)
J. M. Taylor (3 copies)
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