Part 21 Report - 2001-110
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|Power Reactor |Event Number: 37788 |
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| FACILITY: SUMMER REGION: 2 |NOTIFICATION DATE: 02/28/2001|
| UNIT: [1] [] [] STATE: SC |NOTIFICATION TIME: 14:42[EST]|
| RXTYPE: [1] W-3-LP |EVENT DATE: 01/12/2001|
+------------------------------------------------+EVENT TIME: 12:08[EST]|
| NRC NOTIFIED BY: KELLEY MARSH |LAST UPDATE DATE: 02/28/2001|
| HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: N/A |STEPHEN CAHILL R2 |
|10 CFR SECTION: |VERN HODGE NRR |
|CCCC 21.21 UNSPECIFIED PARAGRAPH |RICHARD CONTE R1 |
| |ANTON VEGEL R3 |
| |LINDA HOWELL R4 |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N N 0 Refueling |0 Startup |
| | |
| | |
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EVENT TEXT
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| 10 CFR PART 21 REPORT REGARDING A SUBSTANTIAL SAFETY HAZARD WITH A WOODWARD |
| GOVERNOR EGB UNIT |
| |
| The following text is a portion of a facsimile received from the licensee: |
| |
| "On 1/12/01, V. C. Summer Nuclear Station (VCSNS) determined that a |
| Substantial Safety Hazard could exist with Woodward governor EGB units |
| failing to properly control the Emergency Diesel Generator [(EDG)]. A |
| condition report (received on 1/12/01) from B. F. Goodrich/Fairbanks Morse |
| indicated there was binding of the terminal shaft internal to an EGB unit |
| removed from the 'A' EDG at VCSNS. The disassembly inspection found that |
| the binding of the terminal shaft was due to the use of clamping screws, |
| which were 1/8 inch longer than specification, resulting in binding on the |
| output servo piston connecting rod. |
| |
| "This error was made during the prior refurbishment of the EGB by Engine |
| Systems Inc. (ESI), the Woodward Governor nuclear representative, on |
| 2/24/00. The use of the longer screws resulting in binding in the unit is |
| considered a defect, which was introduced during the repair process by ESI. |
| |
| "[VCSNS] utilizes these EGB units on both the 'A' and 'B' EDGs. The above |
| condition produced severe frequency oscillations on the output of the 'A' |
| EDG. This condition could have been introduced to any EGB during |
| refurbishment by ESI, passed acceptance testing, and be present on both |
| EDGs. In an emergency condition, both EDGs could fail, resulting in the |
| loss of safety function for the emergency on-site power supply. |
| |
| "The EGB units currently installed on both EDGs have been refurbished by |
| Fairbanks Morse with properly specified parts. Fairbanks Morse will perform |
| all future EGB refurbishment work for VCSNS. Other cause and corrective |
| actions associated with the governor issues are being addressed under Root |
| Cause Analysis report RCA 01-0235, 'Diesel Generator 'A' Governor Problems.' |
| " |
| |
| The licensee notified the NRC resident inspector. |
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Page Last Reviewed/Updated Wednesday, March 24, 2021