ML20148E042
| ML20148E042 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 03/07/1988 |
| From: | Pleniewicz R COMMONWEALTH EDISON CO. |
| To: | Murley T Office of Nuclear Reactor Regulation |
| References | |
| BYRON-88-0155, BYRON-88-155, NUDOCS 8803240438 | |
| Download: ML20148E042 (33) | |
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1 BYRON NUCLEAR POWER STATION ANNUAL 10 CFR 50.59 REPOR1*
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CCHMONWEALTH EDISON CCMPA2d NRC DOCKET NO/ 50-454 AND 50-455 LICENSE NOi:NPF-37 AND NPF-65' o
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PDR ADOCK 05000454
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MODIFICATTON M6-1-84-246 s
DESCRIPTION I
This modif.
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erformed the following:
1 A.
Additv of valves I.lCV8114 and ICV 8116) and interlocks at the centrifugal charging pumps' ainiflow lines to provide charging flowpaths during high reactor coolant system pressure conditions, preventing charging pump deadheading. This includes the installation of the necess'ary reector coolant system wide range pressure instrumentation.
B.
Addition of/ Main Ccotrol Room indication and alarms for seal water heat exchanger tube side temperature and shall side flow.
C.
Replacement of the reactor coolant wide range pressure instrumentation which is interlocked with the pressuriser power operated relief valves, required for cold overpressure protection.
SAFEIT EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated-in the Final Safety Analysis Report (FSAR) is not increased by this modification because the Chemical and Volume Control System (CV) system will be operated as presently described in the FSAR. The new valves increase pump reliability by providing CV flowpath during high reactor coolant pressure conditions and prevents pump deadbeading. The pressuriser Power Operated Relief Valve (PORV) logic is not changed from its description in the FSAR. Existing pressure transmitters have been replaced with comparable safety related transmitters.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because the operation of the CV system is not being changed from that as described in the FSAR. The miniflow line does not close unless a low pressure signal is received from the reactor coolant transmitters in conjunction with a safety injection signal. The new CV valves provide the redundancy
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required for isolating the miniflow line when applicable. The safety related function of the pressuriser PORV's is not changed.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because no unreviewed safety questions esist. The CV system continues to be operated in accordance with the existing Technical Specification. The additions increase the reliability of the CV pumps, increasing the margin of safety afforded by the system.
Pressuriser PORY operation is not changed relative to the pre %nt Technical Specification. (1884M/0215M)
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MODIFICAkf0N M6-1-84-261 & Mf-2-85-693 DESCRIPTION Thir' nodification added an auxiliary pump skid to the Wide Range G; S 25cnitor (W9CM). FSAR appenaix E.30 was updated to reflect this change.
SAFErY EVALUATION ST2y_AQ*.
1.
The probability of an occurrence or the conamIuence of an accident, or malluretion of equipe2ent important to safety us proviously evaluated in tha FSM. ~1s not incer,ased by this modification because the operation of the WRGW was not ad nesely affected by thir addition. The operability of the WRGM was not assumed in the accident analysis for safe shutdown.
2.'~ The possibility for an accident or malfunctkn of a different type than any previovsly evaluated in T.he FSAR is not created because this modification was an enhancement to the present syster.. FSAR accident analyses do not require the WRGM in any assumption. FSAR appendix E.30 was updated to describe the change.
3.
The unrgin of safety, as defin&d in the basia for any Technical Spectheation is not reduced acause this iaodification did not affect the op3rability of the radiation monitoring syst un as described in the basis for the Radiation Mon: tor ','chnical Specific ation
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1 4 (188&uC215M) i t
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MODIFICATION M6-0-85-003 DESCRIPTION This modification replaced 54" butterfly dampers with 54" bubble-tight dampers on the Control Room ventilation system. The dampers are part of the smoke removal system used to purge the Control Room with maximum outside air and exhaust smoke to the Turbine Building following extinguishment of a fire. The bubble-tight dampers were installed to prevent unfiltered in-leakage to the Control Room.
SAFFIY EVALUATIN
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the bubble-tight dampers prevent unfiltered in-leakage of potentially contaminated air to the Control Room ventilation system. The zero leakage dampers enable the VC system to operate to maintain habitability in accordance with FSAR assumptions. The purge dampers can be opened to remove smoke from the Control Room following extinguishment of a fire within the Control Room envelope.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because the bubble-tight purge dampers operate in accordance with the design needed to satisfy the requirements of the FSAR. The zero leakage dampers prevent unfiltered in-leakage when closed and provide smoke removal capability when opened.
3.
The margin of safety, as defined in the basis for any Technical l
Specification is not reduced because the normally closed dampers are j
tested to fail CLOSED on receipt of a High Radiation MCR Intake test signal to ensure isolation of the Control Room.
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(1884M/0215M)
.1 MOD 2FICATION M6-0-65-115 DESCRIPTION This modification replaced existing Diesel Fire Pump Battery terminal lugs with crimp type lugs.
Previously installed lugs had a tendency to loosen due to thermal cycling.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because this modification does not affect equipment important to safety previously evaluated in the FSAR.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because this modification reduced the probability of terminal loosening due to thermal cycling.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because this modification does not effect equipment to which the basis for any Technical Specification is applicable.
1 (1884M/0215M)
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MODIFICATION M6-0-83-426 DESCRIPTION This modification added a 4" connection and isolation valve to facilitate installation of a sprinkler system in the track bay area of the Unit 2 Turbine Building.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because this modification affects no equipment important to safety as evaluated in the PSAR.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazard is created or introduced by this modification which can affect safety related equipment.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because this modification has no effect on any Technical Specification listed equipment.
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.s MODIFICATION M6-0-85-463 DESCRIPTION This modification provided for the installation of 3-hour rated thermafiber cover plates for hatchways in the floor of the upper cable spreading room.
The covers were necessary to satisfy the fire protection requirements for a 3-hour rated flow.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because it completed installation of the fire barrier which is part of original design.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazard was created or introduced by this modification.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because this modification conforms to original design criteria.
4 (1884M/0215M)
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MODIFICATION M6-0-85-666 DESCRIPTION This modification added a low point drain between the isolation valve and deluge valve in the fire suppression piping for protecting Primary Containment Ventilation and Primary Containment Purgs System charcoal filters. The purpose of this modification was to provide a drain point between the two valves to prevent wetting the charcoal filters during testing.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipmenc important to safety as previously evaluated in the FSAR is not increased by this modification because this modification did not affect the operation or function of the system.
2.
The possibility for an accideat or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazards which could affect protection of the charcoal filters were created or introduced.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because the intent and function of the associated fire protection piping was not altered by this modification, l
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MODIFICATIOM M6-1-05-049 DESCRIPTION This modification was installed to replace the Pressurizer Power Operated Relief Valve (PORV) Actuator Nitrogen Supply System. The high pressure nitrogen supply system and accumulators were replaced with a low pressure instrument air supply and accumulators.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence 'of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the new instrument air supply system as installed is safety related and seismic related.
This installation is from the supply side of the accumulators to the PORV control solenoids. Furthermore, the new system allows operation of the PORV's within their designed operating parameters. Also, the reactor coolant system and pressurizer safety valves were not modified.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because the operation of the pressurizer and its PORV's is unchanged. The new instrument air system is safety related and seismic related. The PORV's continue to.
operate within their specified operating parameters.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because the pressurizer and the PORV's remain opsrable as defined in the Technical Specifications. The new instrument air system supplies a more reliable control system for the PORV's than did the previous nitrogen system.
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(1884M/0215M)
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MODIFXCATION M6-1-85-224 DESCRIPTION This modification provides local level indication for the reactor cavity by painting a scale on the refueling cavity wall.
SAFEIY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because it adds an insignificant amount of undocumented coating in the containment and has no affect on safe shutdown capabilities.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because it does not affect system operability. The addition of this insignificant amount of undocumented coating in conta'nment has an inconsequential impact on containment sump screen blockage and, therefore, has no affect on safe shutdown capabilities.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced Decause this modification allows compliance with Technical Specification 4/4.9.10.
This is accomplished by providing local verification of the required 23 feet of water over the top of the reactor vessel flange during refueling operation.
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.1 MODIFICATION M6-1-85-382 DESCRIPTION This modification altered control cards for fire detection zones protected by ultra violet light detectors such that detection alarms received from these zones "seal in" at Fire Detection Panel IPM09J in the Main Control Room upon actuation.
SAFrrY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because this modification enhanced the fire detection system by providing more reliable indication.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazards were created or introduced by this modification.
3.
The margin of safety, as defined in the basis for any Technical Specification is not rsduced because increased reliability serves only to increase the margin oc safety.
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MODIFICATION M6-1-83-427 DESCRIPTION This modification relocated a teledyne remote lar.p to provide adequate illumination of required equipment. There were no FSAR or Technical Specification changes required by this Modification.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the light itself is not required as part of any accident analysis.
It is not required for the safe shutdown of the plant.
2.
The possibility for an accident or malfunction of a different type t.% n any previously evaluated in the FSAR is not created because the repositioning of the light did not affect the operability of any equipment required or addressed in the FSAR accident analysis.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because this modification did not affect the operability of any equipment assumed in the basis for any Technical Specification. The relocation of the light is not addressed in the basis for any Technical Specification.
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MODIFICATION M6-1-85-483 l
l DESCRIPTION This modification added stiffener plates to rigid pipe supports for a safety related fire protection line in the Auxiliary Building.
SAITTY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because this modification increased the strength of the Fire Protection piping support.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazard was created or introduced by this modification.
3.
The margin of cafety, as defined in the basis for any Technical Specification is not reduced because this modification enhanced the support of fire protection piping which can only serve to increase the margin of safety.
_ (1884M/0215M)
MODIFICATION M6-1-85-528 DESCRIPTION This modification installs interlocks on the Main Power system to trip the Byron Generator on a grid /line instability.
SAITTY EVAI,UATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously ovaluated in the FSAR is not increased by this modification because the main generator and main power system are not assumed operable or required as part of e.la FSAR accident analyses. The FSAR description has been updated to describe the changes to the system.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because thir modification does not affect the operability of any equipment required by the FSAR Accident Analysis.
3 The margin of safety, as defined in the basis for any Teetmical-Specification is not reduced because this modification of the Rdn Pater System does not alter any system required by the Technicil Specifications. The Main Power System itself is not requ:rei or addressed in the basis of any Technical Specification.
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e MODIFICATION M6-1-85-703 DESCRIPTION This modification enhanced fire detection capability by adding ionization detectors in the Fuel Handling Building, Auxiliary Building and BOP Battery Room.
SAITrY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased because additional fire detection capability provided by this modification can only serve to reduce the potential consequences of a fire.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazards were created or introduced by this modification.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because the intent and function of the fire detection system is unchanged by this modification.
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l MOD 2FICATION M6-0-86-030 DESCRIPTION This modification provided drain lines between isolation valves and deluge valves in fire suppression to various ventilation system charcoal filters to facilitate testing of the deluge system without wetting the charcoal filters.
Additionally, this modification added new normally closed isolation valves to the fire suppression piping upstream of the drain lines in order to provide i
more positive (double valve) isolation capability and prevent wetting charcoal filters due to valve leakage during normal operation.
SAETrY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or f
malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because this modification does not affect any equipment important to safety in its normal or emergency mode of operation.
t 2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazards are created or introduced by this modification.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because this modification does not affect the intent or function of the system, but does eliminate a potential to equipment., namely, wetting of the filter medium.
1
- (1884M/0215M)
MODIFICATION M6-0-86-039 DESCRIPTION This modification provided a new heat detection system, including an extended heat sensing line and an additional detection / alarm panel for the Control Room Ventilation System Charcoal Filters. This modification was done to enhance the fire detection capabilities of the system.
SAITfY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the modification has no effect on equipment identified as important to safety in the FSAR.
3.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because the modification improves the fire detection capability without creating or introducing new hazards.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because improved fire detection capability can serve only to increase the margin of safety.
1 l (1884M/0215N) l
MODIFICATION M6-0-86-090 DESCRIPTION This modification relocated the deluge valve and upstream isolation valve for fire suppression to the Service Building ventilation charcoal filter to facilitate access. Additionally, a drain line was installed between the two valves to facilitate testing. This modification also changes the position of the upstream isolation valve from "open" to "closed" to provide more positive isolation of the fire suppression system and prevent wetting the charcoal filter due to valve leakage.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because system operation is unaffected by this modification.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazards have been created or introduced by this modification.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because the intent, function and method of operation of the system is not changed by this modification.
. (1884M/0215M)
MODIFICATICal M6-0-86-095 DESCRIPTION This modification revised the Process Radiation Main Control Room Ventilation System interlock logic from the current design of one out of two monitors for radiation detection, and one out of two monitors for monitor operational failure to one out of two monitors for radiation detection, and two out of two monitors for monitor operational failures. This minimized spurious actuations of the system.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the Main Control Room Ventilation System Makeup Fan and Dampers will automatically actuate during radiation detection from either monitor (1/2) on the ventilation trains. Automatic actuation of the Makeup Fan for monitor operational failures is not addressed and revising their logic to 2/2 will not affect any accident analysis.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because the Main Control Roon Ventilation System Makeup Fan and Dampers will automatically actuate during radiation detection from either monitor (1/2) on the ventilation fans. Automatic actuation of the Makeup Fan and Dampers for monitor operational failures is not specifically addressed and revising the interlock logic to 2/2 monitors will not affect any accident analysis.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because Technical Specification 3.7.6 only l
requires automatic actuation of the Makeup Fan and Dampers from a Main Control Room Process Radiation Monitor high radiation signal. Automatic l
actuation of the Makeup Fan and associated equipment from monitor operational failures is not addressed in Technical Specifications 3.3.3.1 and 3.7.6.
Thus, implementation of this modification will not reduce the margin of safety per any Technical Specification. (1884M/0215M)
T MODIFICATION M6-0-86-123 DESCRIPTION This modification revised the Auxiliary Building Ventilation System (VA) supply and exhaust airflows to ensure adequate flows to all areas of the Auxiliary Building. The VA System was originally balanced to support Unit-1 operation only.
SAETTY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the VA System is now operating as originally designed, supporting all areas of the Auxiliary Building. To achieve this, ainor changes were made to ensure adequate airflows and proper airflow directions. No changes were made which affect the operation of any equipment important to safety as evaluated in the PSAR.
The possibility for an accident or malfunction of a different type than 2.
any previously evaluated in the FSAR is not created because this modification does not change the operation of the VA System as described in the FSAR, therefore, no unanalysed safety condition will be created._
3.
The margin of safety, as defined in the basis for any Technical
)
Specification is not rcduced because this modification satisfied specific?
requirements to ensure adequate airflows and proper airflow directions as:
defined in the basis of the Technical Specifications. Therefore, the margin of safety will not be reduced.
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! (1684M/0215M) i I
MODIFICATION M6-0-86-140 DESCRIPTION This modification provided a removable duct section in the Auxiliary Building Ventilation System to allow access to a fire damper for tests and inspections.
SAFTrY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because it resulted in no effects on system performance or operation.
2.
The possibility f Jr an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because this modification has no affect on the method or means of system operation.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because no Technical Specifications are affected by this modification.
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.o MODIFICATION M6-0-86-181 DESCRIPTION This modification modifies the laterals in the resin separation vessel to accommodate a 3:1 Cation to Anion resin ratio. The work initiated raising the lateral to the new interface level created by the adjustment to the resin ratio.
SAIT1'Y EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the PSAR is not increased by this modification because the ulteration to the separation is only a mechanical change to reflect the new resin cation to anion interface level. No other equipment or function is affected.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because the modification is to the internals of the resin separation tank. No additional equipment is added or safety equipment removed. The function of the equipment is enhanced because it will provide a better separation of cation and anion resin for regeneration.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because the internals of the resin separation vessel and the effectiveness of the resin separation does not affect any Technical Specification nor is it referenced by any Technical Specification.
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. (1884M/0215M) l l
MODIFICATION M6-0-86-240 DESCRIPTION This modification enlarged a number of Control Room Ventilation system access doors to fire dampers to facilitate test and inspection performance.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because this modification has no affect on the safety function of the equipment involved.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created becausa no change in method or means of system operation occurs due to this modification.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because the affected equipment is not addressed in the Technical Specifications.
i l (1884M/02:5M)
MODZFICATION M6-1-86-051 DESCRIPTION This modification relocated a Turbine Building branch sprinkler line in the Fire Protection System such that flow from the sprinklers would not be obstructed to the fire hazard area. This modification was necessary due to routing of a larger heater drain line.
SAITrY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunctior. of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because no equipment specified as important to safety in the FSAR was affected.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because no new hazards were created or introduced as a result of this modification.
3.
Tha margin of safety, as defined in the basis for any Technical Specification is not reduced because this modification improved the spacing pattern of the nozzles, thereby, increasing the margin of safety.
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MODIFICATION M6-1-86-166 DESCRIPTION This modification removed various pipe whip restraints and jet deflectors from tne Unit 1 Reactor Coolant System (RCS) piping inside containment. This modification was based on a letter from B. J. Youngblood (NRC) to D.L. Farrar (CECO) dccumenting NRC approval of the CECO request for exemption from a portion of General Design Criteria (GDC) #4. Appendix A, 10CFR50.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because a "leak before break" analysis has been approved by the NRC as an exemption from a portion of General Design Criterion (GDC) #4, Appendix A,10CFR50, which requires protective jet deflectors and whip restraints as described in the FSAR. The analysis demonstrates that the probability of pipe breaks in Primary Coolant Piping is sufficiently low to eliminate pipe breaks as a design criteria for the installation of deflectors and restraints. The conditions and ausumptions of other plant design bases as defined by the FSAR are not impacted.
2.
The possibility for an accident or malfunction of a different type than~
any previously evaluated in the FSAR is not created because this modification is based on the subject "leak before break" analysis, which demonstrates that small piping flaws will be detected through Inservice Inspection Programs or leakage inonitoring systems long before critical conditions which may result in large pipe breaks are created.
3.
The margin of safety, as defined in the basis for any Technical l
Specification is not reduced because this modification removes whip
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restraints and jet deflectors which are not addressed in the Technical Specifications. The removal of jet deflectors and whip restraints does not impair the plant capability to be operated within the Technical Specification operating basis. Inservice Inspection and ALARA considerations will be improved with the absence of the restraints and deflectors. (1884M/0215M) l
9 d
MODIFICATION M6-1-86-206 DESCRIPTION This modification performed snubber reduction on 67 piping subsystems on Unit 1.
Three-hundred (300) snubbers were deleted and an additional 116 snubbers were replaced with struts.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the snubber reduction was performed using revised damping values defined in ASME Code Case N-411 for seismic loadings, as approved by the N E,.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because this modification included post-installation thermal monitoring during heat-up to verify the new design thermal movements are within design limits.
Seismic interaction walkdowns were performed to verify that the new design seismic movements did not aversely affect the piping or adjacent structures, components, and equipment.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because this modification reduces the number of snubbers in the plant. Existing safety margins for seismic and thermal piping movements are maintained, therefore, the margin of safety asstaned in Technical Specifications 3.4.10, Structural Integrity, and 3.7.8, Snubbers, is not affected. (1884M/0215M)
l-MODIFICATION M6-1-86-212 DESCRIPTION This modification deletes the Containment Spray Additive Tank Nitrogen Supply Check Valve, ICSO44. This deletion allows an adequate nitrogen blanket to be applied to the containment spray additive tank. previously, the minimum opening pressure of the check valve could not be overcome.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the removal of this check valve insures the nitrogen blanket is applied to the containment spray additive tank. The containment spray system continues to operate per design.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because the removal of this check valve enhances the containment spray system. Its removal does not impair the containment spray system from performing its safety related function. Its removal ensures the ability to apply a nitrogen blanket to the containment spray system.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because it is unaffected. The containment spray system operability continues to be maintained per the Technical Specifications.
- (1884M/0215M)
6 MODIFICATION M6-1-86-215 DESCRIPTION This modification provided for the sealing of spare electrical conduit sleeves in various fire walls throughout the plant.
SAITrY EVALUATION StJMMARY 1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because this modification reduces the potential for a fire spreading through an unsealed penetration.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the PSAR is not created because no new hazards are created or introduced by this modification.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because the ability to contain a potential fire is enhanced by this modification.
4 (1884M/0215M)
4
.a-MODIFICATION M6-1-86-261 DESCRIPTION Thismodificationenhancedmanualfirefihntingcapabnitybyadding100 feet of hose to an existing Turbine Building hose statien. The new hose provided additional capability to fight a potential fire in the Main Steam Isolation Valve rooms.
SAFETY 0 VALUATION
SUMMARY
l/
s 1.
The probability of an occurrence or the consequence of an accident, or malfunccion of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because addition of manual fire fighting capability can only serve to lessen the consequences of a fire.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because this equipment has no function until a fire occurs at which time it increases fire fighting capability.
3.
The margin of safety, as defined in the tesis for any Technical 3
Specification is not reduced because thi:s equipr.ent increases the capability to fight fires, j
s b
. (1884M/0215M)
~
?
.. f MODIFICATION M6-0-87-Af6 DESCRIPTION This modification installed filters on the Condsnsate Polisher (CP) regenerate discharge line to the flume. The filtern were installed to remove suspended solids from the waste streem to assure compliance with the plant NPDES perinit.
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to reafety as previously evaluated in the FSAR is not increased by this modification because the new filters will only remove dirt and solids from the waste stream to produce a cleaner water for discharge. The improved waste stream will not affect the probability of an occurrence or any safety function as previously evaluated in the FSAR.
q 2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because the filters affect only the CP regenerate waste stream. The new filters do not affect any safety related equipment or the safety function of any equipment.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because the filtration of the waste stream does not affect any Technical Specification.
It only produces a cleaner
(
waste stream to comply with the NPDES permit or any Technical Specifications that limits radiological release from the Ifquid waste streams of the plant.
a i
1 I
l l
l (1884M/0215M)
k t
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s e
MODIF7 CATION M6-1-87-010 DESCRIPTION This nodification installed pi e supports on pilot piging for control valves
?
in the Cdrbon Dioxide Fire Suppressiott System:
SAFETY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence <f an accident, or ralfunction of equipment important to safety'as pre 9iously evalcated in the FSAR is not increased by_this modification because'nsither the method or means of system operation ae t'escribed la the Fire Protecticv1 Reoort is altered by this modification.
Thd possibility for an accide0t or malfunction of a dfferent type than 2.
any previcusly evaluated in the PSAR is not cre ated oecause no' ftew hazards are created or introduced by this modification.
3.
The mat. in of nafety, as defined in the basis for any Technical SI;ucifi.ution is not reduced because installation of permanent supports iteprovec systen "allability but does not affect system operation.
i
/
/
l e
l l
\\
l l (1884M/0215M l
f,o,
.s MODIFICATION M6-2-ft7-ll7 DESCRIPTION This mydification eliminated the Reactor Trip from Turbine Trip below P-8 (30%). All required Technical Specifi:.:ation changes have been received.
SAFErY EVALUATION
SUMMARY
1.
The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased by this modification because the additional required steam dump capacity will be handled by the ducps since they are designed to handle 40% of plant capacity. Also, the FSAR Section 15 analyses do not assume the Turbine Trip functional for any analysis.
The possibility for an accident or malfunction of a different type than any previously evaluated in the FSAR is not created because this modification did not alter any plant equipment required by any safety analysis in the FSAR Section 15.
Those analyses assume no Turbine Trip on Reactor Trip or vice versa. OIAT Reactor Trips function in each case to maintain DNBR.
3.
The margin of safety, as defined in the basis for any Technical Specification is not reduced because this modification did not alter any equipment specified in the basis of any Tech Spec.
-FINAL-l
' (1884M/0215M) 1
r~w C mm:nwrith Edison
\\ Byron Nuclear Station i ) 4450 North German Church Road
} Byron, Illinois 61010 Mm ch 1, 1988 LTR:
BYRON 88-0155 Mr. Tom Murley Director Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Murley:
Pursuant to requirements to report on an annual basis, as stated in 10 CFR 50.59 and Byron Station license #NPF-37 item 2.c.6.c, Byron Station (license
- NPF-37 and NPF-66) is submitting the enclosed report. This report consists of item descriptions and their respective Safety Evaluation. Included also as part of this report, are changes made to features of the fire protection program, not previously approved by the commission.
One signed original and thirty-nine copies are provided for your use.
Sincerely, A
R. Pleniewicz Station Manager Byron Nuclear Power Station RP/JC/bb (1884M/0125M)
Enclosures A Bert Davis, Regional Administrator NRC, Region III cc:
P. Brochman, NRC Resident Inspector, Byron CECO Distribution List 6
4 lI