ML19253A096: Difference between revisions
StriderTol (talk | contribs) Created page by program invented by StriderTol |
StriderTol (talk | contribs) StriderTol Bot change |
||
| Line 11: | Line 11: | ||
| contact person = | | contact person = | ||
| document report number = NUDOCS 7907170005 | | document report number = NUDOCS 7907170005 | ||
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO | | document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER), TEXT-SAFETY REPORT | ||
| page count = 1 | | page count = 1 | ||
}} | }} | ||
=Text= | =Text= | ||
{{#Wiki_filter:, | {{#Wiki_filter:, | ||
h. | h. | ||
I W | I W | ||
A u---- | A | ||
-)ISWPP u---- | |||
a ciiiS O N June 29, 1979 OIE Region III USNRC 799 Roosevelt Road Glen Ellyn, Illinois 60137 ATTENTION: Tom Tambling, Inspector - Operations Branch | |||
==SUBJECT:== | ==SUBJECT:== | ||
Violation of Technical Specification 3.4.1 Davis-Besse Unit 1 - Mode 5, Power (MWT) = 0, and Load (MWE) = 0 At 0157 hours on June 28, 1979, while conducting surveillance testing on the | Violation of Technical Specification 3.4.1 Davis-Besse Unit 1 - Mode 5, Power (MWT) = 0, and Load (MWE) = 0 At 0157 hours on June 28, 1979, while conducting surveillance testing on the i | ||
to RPS Channel 4 Y4 was 1 cst causing a loss of power to the Safety Features Actuation System (SFAS) Channel 4. The SEAS Channel 4 Bistables tripped as | Reactor Protection System (RPS) Channel 4, the Instrument and Control Technician shorted several terminals with an allegator clip. The 120 Volt AC power supply to RPS Channel 4 Y4 was 1 cst causing a loss of power to the Safety Features Actuation System (SFAS) Channel 4. | ||
The closure of DH 11 isolated the DH System and since there were no Reactor Coolant Pumps in operation, placed the unit in violation of Technical Specifi-cation 3.4.1. The Decay Heat Pump was manually shutdown before all DH flow was lost to protect the pump. | The SEAS Channel 4 Bistables tripped as j | ||
designed upon a loss of pnwer. | |||
The reip of one SFAS channel does not actuate any SFAS incide... le.1 bui -.. e Lt e v! 371.3 C'.~nael 4 does actuate the Bistable which closed the Decay Heat (DH) Normal Cooldown Isolation Valve DH 11. | |||
The closure of DH 11 isolated the DH System and since there were no Reactor Coolant Pumps in operation, placed the unit in violation of Technical Specifi-cation 3.4.1. | |||
The Decay Heat Pump was manually shutdown before all DH flow was lost to protect the pump. | |||
By 0215 hours, Y4 was re-ancrgized, DH 11 was re-opened, DH Pump 1-2 was re-started, and a Decay Heat Flowrate of greater than 2800 GPM was established. | By 0215 hours, Y4 was re-ancrgized, DH 11 was re-opened, DH Pump 1-2 was re-started, and a Decay Heat Flowrate of greater than 2800 GPM was established. | ||
Tom Tambling, Region III NRC was notified of the violation at 1010 hours on June 29, 1979. | Tom Tambling, Region III NRC was notified of the violation at 1010 hours on June 29, 1979. | ||
n JAM l/& | n JAM l/& | ||
Terry Murray Station Superintendent Davis-Besse Nuclear Power Station Unit #1 | Terry Murray Station Superintendent Davis-Besse Nuclear Power Station Unit #1 L | ||
TDM/SNB/cjb | 0' I | ||
TDM/SNB/cjb o | |||
2091 139 THE TCLECO EDISCN COMPANY EDISCN PLAZA 3CO MACISCN AVENUE TCLECO. CH:0 43552 (N | |||
E 7 9 0717 0(0(De$I~ | |||
...}} | |||
Latest revision as of 08:55, 4 January 2025
| ML19253A096 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/29/1979 |
| From: | Murray T TOLEDO EDISON CO. |
| To: | |
| References | |
| NUDOCS 7907170005 | |
| Download: ML19253A096 (1) | |
Text
,
h.
I W
A
-)ISWPP u----
a ciiiS O N June 29, 1979 OIE Region III USNRC 799 Roosevelt Road Glen Ellyn, Illinois 60137 ATTENTION: Tom Tambling, Inspector - Operations Branch
SUBJECT:
Violation of Technical Specification 3.4.1 Davis-Besse Unit 1 - Mode 5, Power (MWT) = 0, and Load (MWE) = 0 At 0157 hours0.00182 days <br />0.0436 hours <br />2.595899e-4 weeks <br />5.97385e-5 months <br /> on June 28, 1979, while conducting surveillance testing on the i
Reactor Protection System (RPS) Channel 4, the Instrument and Control Technician shorted several terminals with an allegator clip. The 120 Volt AC power supply to RPS Channel 4 Y4 was 1 cst causing a loss of power to the Safety Features Actuation System (SFAS) Channel 4.
The SEAS Channel 4 Bistables tripped as j
designed upon a loss of pnwer.
The reip of one SFAS channel does not actuate any SFAS incide... le.1 bui -.. e Lt e v! 371.3 C'.~nael 4 does actuate the Bistable which closed the Decay Heat (DH) Normal Cooldown Isolation Valve DH 11.
The closure of DH 11 isolated the DH System and since there were no Reactor Coolant Pumps in operation, placed the unit in violation of Technical Specifi-cation 3.4.1.
The Decay Heat Pump was manually shutdown before all DH flow was lost to protect the pump.
By 0215 hours0.00249 days <br />0.0597 hours <br />3.554894e-4 weeks <br />8.18075e-5 months <br />, Y4 was re-ancrgized, DH 11 was re-opened, DH Pump 1-2 was re-started, and a Decay Heat Flowrate of greater than 2800 GPM was established.
Tom Tambling, Region III NRC was notified of the violation at 1010 hours0.0117 days <br />0.281 hours <br />0.00167 weeks <br />3.84305e-4 months <br /> on June 29, 1979.
n JAM l/&
Terry Murray Station Superintendent Davis-Besse Nuclear Power Station Unit #1 L
0' I
TDM/SNB/cjb o
2091 139 THE TCLECO EDISCN COMPANY EDISCN PLAZA 3CO MACISCN AVENUE TCLECO. CH:0 43552 (N
E 7 9 0717 0(0(De$I~
...