ML18032A529
| ML18032A529 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/30/1987 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML18032A526 | List: |
| References | |
| NUDOCS 8709030368 | |
| Download: ML18032A529 (12) | |
Text
ENCLOSURE 2
TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT RADIOACTIVE INOPERABLE EFFLUENT INSTRUMENTATION REPORT 8709030368 870828 PDR ADOCK 05000259 R
II
Radioactive Ino erable Effluent Instrumentation Re ort t
This report is to comply with Radiological Effluent Technical Specifications (RETS) section 3.2.0.2 and 3.2.K.2 reporting requirements for instruments that are inoperable for more than 30 days.
The RETS became effective at BFN on Hay 6, 1987.
Therefore this report only covers the period from May 6 June 30, 1987.
Because of significant technical specification
- changes, a
large number of radioactive effluent monitoring instruments became technically inoperable on May 6, 1987.
RETS were incorporated during a BFN administrative outage.
Site resources were and still are endeavoring to resolve previously identified problem areas.
Hodifications required to bring BFN effluent monitoring equipment into technical compliance with RETS competes
- for, resources with other regulatory driven modifications.
This report explains why the inoperability of each instrument was not corrected in a timely manner.
The instruments that were inoperable for more than 30 days are:
t RHR service water monitor RHR service water monitor RHR service water monitor 1-90-133 1-90-134 2-90-133 RHR service water monitor 2-90-134 RHR service water monitor 3-90-133 RHR service water monitor 3-90-134 Raw cooling water monitor 1-90-132 Raw cooling water monitor 2-90-132 Raw cooling water monitor 3-90-132 Liquid radwaste discharge monitor 0-90-130 Liquid radwaste discharge flow loop 77-60 Stack effluent flow meter 90-271 Stack effluent monitor 90-147A
Stack effluent monitor 90-147B
/
Building ventilation exhaust monitor 1-90-249 Building ventilation exhaust monitor 1-90-250 Building ventilation exhaust monitor 1-90-251 Building ventilation exhaust monitor 2-90-249 Building ventilation exhaust monitor 2-90-250 Building ventilation exhaust monitor 3-90-250 Building ventilation exhaust monitor 0-90-252 Posttreatment noble gas monitor Posttreatment noble gas monitor Posttreatment noble gas monitor Posttreatment noble gas monitor Posttreatment noble gas monitor 1-90-265 1-90-266 2-90-265 2-90-266 3-90-265 t
Posttreatment noble gas monitor 3-90-266 During the entire reporting period fuel was off loaded from all three units- -.-
and all compensatory sampling requirements were met.
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Li uid Process Radiation Monitors BFN RETS Table 3.2.0 requires RHR Service Water Monitors (1 133, 1-90-134, 2-90-133, 2-90-134, 3-90-133, and 3-90-134) and Raw Cdoling Water Monitors (1-90-132, 2-90-132, and 3-90-132) to be operable when these systems are in service.
Contrary to this requirement, these nine monitors were inoperable during the entire reporting period.
These monitors were declared inoperable because they were not designed to meet the requirements in RETS Table 4.2.D Footnote 2.
This footnote requires that control room annunciation occur if instrument controls are not set in operate mode.
Oesign Change Request 1687, revision 1, was written to correct this problem and was approved on September 29, 1986.
Engineering Change Notices (ECNs)
P0976 (Unit 1),
P0977 (Unit 2),
and P0978 (Unit 3) were issued August 7,
1987 and these modifications wi 11 be complete and the monitors will be fully operable by March 31, 1988.
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Li uid Radwaste Effluent Instrumentation BFN RETS Table 3.2.0 requires the liquid radwaste effluent'onitor (90-130) and flow rate loop (77-60) to be operable during liquid radwaste releases.
Contrary to this requirement, these two instruments were technically inoperable during the entire reporting period.
The liquid radwaste effluent monitor was declared technically inoperable because it was not designed to meet the requirements in RETS Table 4.2.0 Footnote 1.
Footnote 1 requires automatic isolation to occur if the instrument encounters an inoperative/downscale failure.
The monitor was,
- however, in service and would have alarmed causing operator action to terminate release.
Additionally, the required supplemental sampling.
'equirements were performed.
DCR 3417 Rl'as written to correct this problem and was approved on February 6, 1987.
ECN 5523 was issued June 18, 1987 and this modification will be complete and the monitors will be fully operable by t
November 30, 1987.
The flow rate loop was declared technically inoperable because Surveillance-Instructions (SIs) to meet the channel calibration and functional test, requirements were not written and performed.
The flow rate loop (77-60) will be fully calibrated and operable by October 31, 1987.
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Stack Radioactive Effluent Instrumentation t
The stack effluent noble gas monitors (90-147A and B) and the stack flow meter (90-271) were inoperable during this reporting period.'FN RETS Table 4.2.K Footnote 1 requires that stack noble gas monitors (90-147A and B) be calibrated using National Bureau of Standards (NBS) traceable radioactive standards.
NBS traceable calibrations were completed on April 13, 1987.
- However, upgraded Surveillance Instructions (SIs) incorporating the new calibration results have not been approved and performed.
The stack flow meter is also inoperable because cal.ibration and functional SIs have not been approved and performed.
Fuel was off-loaded for all three units and no fuel movements occurred during this period.
Results of compensatory lab analyses of stack effluent indicated no anomolies.
The stack noble gas monitors and flow meter will be fully operable by September 30, 1987.
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Bui ldin Ventilation Exhaust Monitors BFN RETS Table 3.2.K requires reactor/turbine building ventilation monitors (1-90-250, 2-90-250, and 3-90-250) and the radwaste building vent monitor (0-90-252) to be operable at all times and the turbine building exhaust monitors (1-90-249, 1-90-251, 2-90-249, 2-90-251, 3-90-249, and 3-90-251) to be operable during releases via this pathway.
Contrary to this requirements, seven monitors (1-90-250, 2-90-250, 3-90-250, 0-90-252, 1-90-249, 1-90-251.
and 3-90-249) were not operable for over 30 days.
Fuel was off-loaded for all three vessels and no fuel handling occurred during the period of inoperability.
Compensatory lab analyses indicated no detectable noble gas activity in ventilation releases.
During the NBS traceable calibration of these radiation monitors in January 1987 by the vendor, Nuclear Measurements Corporation, they determined that the monitors did not meet the lE-6 LLD requirement of BFN RETS Table 4.2.K Footnote 6.
In response to this deficiency, OCR 3421 was approved and ECNs meet the LLO requirements.
This modification is complete on all ten monitors, but two monitors (2-90-250 and 0-90-252) are still inoperable because of sample pump maintenance problems.
New sample pumps have been ordered and the remaining two monitors wi 11 be operable by December 31, 1987.
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r r
Off as Posttreatment I
t BFN RETS Table 3.2.K requires the offgas posttreatment noble gas monitors (1-90-265, 1-90-266, 2-90-265, 2-90-266, 3-90-265, and 3-90-266) to be operable at.all times.
Table 4.2.K requires performance of functional tests and channel calibrations for these radiation monitors.
Contrary to the requirements of Table 4.2.K functional tests and channel calibrations were not performed and the instruments were taken out of service.
Surveillance Instructions for these monitors have been approved and monitors 2-90-265 and 2-90-266 were returned to service in July 1987.
The remaining four monitors encountered sample pump problems.
These pumps are being repaired and all posttreatment radiation monitors will be returned to service by September 30, 1987.
The offgas systems were not in service during this period.
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