ML19289D333
| ML19289D333 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 02/23/1979 |
| From: | Manry M GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML19289D329 | List: |
| References | |
| NUDOCS 7903050341 | |
| Download: ML19289D333 (57) | |
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TABLE OF CONIS'IS c; PA Introduction i Design Ganges and Tests or Experiments Plant Ibsign Changes 1 Test or Experiment Requests 47 Data Tabulations and thique Reporting Requirments occupational Personnel Fadiation Exwsure 48 Reactor Coolant Chemistry Sunitary 53 i
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INTRODUCTION Edwin I. Hatch Nuclear Plant Unit 1 is a Light Water Reactor of 717 MWe Net Maximum Dependable Capacity. Unit 2 also is a Light Water Reactor of 716.3 MWe Net MDC.
Ownership of the plant is fifty and one tenth percent (50.1%) Georgia Power Company, seventeen and seven tenths percent (17.7%) Municipal Electric Author-ity of Georgia, two and two tenths percent (2.2%) City of Dalton, and thirty percent (30%) Oglethorpe Electric Membership Corporation. The plant is locat-ed at a site approximately eleven miles north of Baxley, Georgia on U. S.
Highway 1 on thq, Altamaha river. General Electric Company furnished the Boil-ing Water Reactor N" clear Steam Supply System and the Turbine-Generator. The plant was designed by Southern Company Services Inc. with assistance provided by Bechtel Power Corporation. The condenser cooling method employs forced draft cooling towers and circulating water system. Normal makeup is drawr.
from the Altamaha river. Unit 1 is subject to license DPR-57, issued August 6,1974, pursuant to Docket Number 50-321; Unit 2 to license NPF-5, issued June 13,1978 pursuant to Docket Number 50-366. Unit 1 achieved initial cri-ticality on September 12, 1974, Unit 2 on July 4, 1978 and September 22, 1978, respectively. While Unit 1 was declared commercial on December 31, 1975, Unit 2 is still in startup testing. Georgia Power Corapany has sole respon-sibility for overall planning, design, construction, operation, maintenance, and disposal of the plant.
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- 4 DESIGil CHANGES AND TEST OR EXPERIMEllTS b
The following Safety-Related DCR's are for Unit I unless otherwise noted: - 75-171 Water hammers have been generated in the RHR system because of steam leaking past Ell-F091A & B glove valves. Repair has not been successful on these valves and thus a change to gate valves was'needed to prevent steam leaks which resulted in RER piping hammers and pressurizing of RHR heat exchanger.
The probability of an accident was not increased above those analyzed in the FSAR due to this change.
The margin of safety as defined in the Technical Specifications is not reduced due to this change.
76 4 Instrument E51-N017 (RCIC) failed with no spares available.
This instrument was temporarily replaced with another which read from "-200 to + 200" instead of the former "-300 to
+300". The faulty instrument was then repaired and reolaced.
The probability of an accident was not increased because this was only a temporary change.
The margin of safety was not increased because this was only a temporary change.
76-62 Resistors were installed in the field windings of the DC Motors for the vacuum pump and condensate pump in HPCI and RCIC turbine barometric condenser. This was done to improve motor performance so that under low voltage conditions (i.e.
- 10%) the condensate pump and vacuum pump will satis fy the required condensa te removal flow rate and the required vacuum conditions.
The probability of an accident as analyzed in the FSAR does not result from this change.
The margin of safety as defined in Tech Specs is not reduced due to this change.76-100 Isolation contacts were installed between speed and speed demand circuits in recirculation pump controls. This was done to correct noise that existed in the circuit, which had been unidentifiable.
The probability of an accident as analyzed in FSAR does not result from this change since all possible modes of failure already exist in the system.
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The margin of safety as de fined in the Technical Specifications is not reduced since the only possible mode -
of failure would be for the relay to stick in the energized mode. If this were to happen the recirc pump would be; on minimum speed immediately after a startup and no signsl would be presen) in the position resulting in a scoop tube lockup.76-153 Modified source of alternate power to R24-s018 A and B so that the alternate supply is independent of 1B diesel gene ra tor.
The probability of an accident was not increased because the change does not alter the reliability of the alternate source of power.
The margin of safety was slightly increased because the change provides a more reliable source of alternate power.78-158 Changed setpoint of coolant pressure low shutdown switch from 20 + 1 psig decreasing to 14 + 1 psig dec reasing. The 20 psi setpoint was an initial fac tory setting and norma]
operating pressure is 18 psig.
The probability of an accident does not result because lowering the setpoint per manufactures instructions does not introduce any new failure modes.
The margin of safety was not reduced since nothing has been done to reduce the ability of the diesel generator to perform its designed function.76-176 When the operator in the control room tested the general ground detector relay the appropriate alarm would annunciate. Therefore a jumper was placed between contact
- 5 and terminal B57 on reactor recirc pump and MG set "A" and "B".
The probability of an accident does not result becau se the circuit is not changed only the switch for preventing annunciation is bypassed.
The margin of safety was not reduced since the change does not affect the test procedure, but only makes it easier to perform.76-184 Four GE Model relays were installed in panel Hil-P654 and connected to limit switches for four drywell to torus differential pressure system valves. Thic change stopped two compressors from operating when valves were closed thus preventing damage to compressors.
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The possibility of an accident or malfunction of a different
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type analyzed in the FSAR does not result from .this change since the addition of relays in the containment isolation system does not affect the operation of group II isolation instrument ation .
The margin of sa fety as de fined in the Technical Specifications 3.7 pertaining to maintaining a drywell to torus dP of 1.5 paid, but less than 2.0 psid is not reduced by this change since the ope ration of the containment isolation instrumentation is not changed and the compressors are stopped from operating during a group II isolation when it isn't desirable to have any equipment operating that could possibly further increase drywell pressure.76-203 By lowering the solution high temperature alarm point frcm 110 degrees F, which is the Tech Spec upper limit, to 105 degrees F personnel now will have time to investigate the cause of the high temperature before standby liquid solution reaches its temperature limits.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change.
The margin of safety as defined in the Technical Specifications is not reduced due to this change.
77-11 The torus support system was modified as follows:
(1) Added gusset plates to the column-to-ring girder joints, (2) Anchored the support columns to the reactor bldg. base slab, and (3) completed the unfinished welds on the torus stanchions, tie-in plates. This was all done to increase the load carrying capabilities and thereby increasing the sa fety margin of the torus support system, while maintaining the option of making more extensive modification should it become desirably in the future to do so. This change was initiated because of the convenience to the plant of doing such work at a scheduled outage.
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The possibility of an accident or malfunction of different type than analyzed in the FSAR does not result from this change.
The margin of sa fety as de fined in the Technical Specifications.is not reduced due to this change.
77-24 Start signals from each division were added such that Channel A of the core spray system would start A and B pumps and open A and B valves and so that channel B would do the same. This change removed the chance that one-half of the core spray system would not be inoperative because of channel start failures.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change becau se the channel separation will be maintained. No additional failure modes are thus introduced.
The margin of safety as de fined in the technical specifications is not reduced because the core spray availability would actually be increased.
77-30 Modified diesel generator control cricuits, output circuit breaker circuits, and annunciator circuits to provide capability of D/G 1B providing power on a " swing" basis to both Unit 1 and Unit 2 4KV "F" buses.
The modifications required to complete DCR 77-30 do not create a possibility for an accident or malfunction of a different type than any evaluated previously in the final safety analysis report, or reduce the margin of safety as defined in the basis for any technical specification and therefore does not constitute an unreviewed safety question.
77-31 The absence of a filter in the sensing line had enabled foreign particles to enter the pilot assembly, causing pilot seat leakage and second stage seat scuffing. To correct this problem a filter was placed in the sensing line of the pilot stage of valve B21-F013, to prevent the passage of foreign material into the pilot assembly and second stage cavity and disc seat.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because the filters prevent valve failures associated with foreign matter entering the pilot assemblies. The valves are made more reliable by this addition.
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77-43 Increased the size of the chargers on station service batteries and also changed station batteries to allow additional amp-hour rating for' 'LPCI inverters. This decreased the charging time required for the station batteries and provided additional capacity.
The possibility of an accident or malfunction of a differnet type than analyzed in the FSAR does not result from this change since it involves an improvement in the system.
The margin of safety as defined in the Technical Specifications is not reduced due to this change since it does not affect the operation of the station service ba tteries and chargers: Increasing the sizes actually increase the safety margin.
77-59 Provided power for PSW pump 2P41-C002 for plant service water system flushing by installing a 150 amp frame with 110 amp breaker in R24-S026 frame 2B1 and terminated cable to provide power to motor starter for PSW pump.
The possibility of an accident or malfunction of a different type than that analyzed in the FSAR does not result from this change since no new failure modes are introduced. The PSW pump motor is protected by the 100 amp breaker. The MCC supply breaker will not trip if the 100 amp breaker trips (PSW motor fault).
The margin of sa fety as defined in the Technical Specifications is not reduced due to this change since MCC R24-S026 & 120/208V is still able to perform its design func tion.
77-93 Exposure biased MAPLHGR limits had to be reduced to accomodate non-conservation between 0 and 15,000 MND/T model exposures which had been discoverd during a GE ECCS performance reevaluation. Therefore several changes were made to MAPLHVR limit arrays, all of which involved slight decreasing.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the method of calculating the limits is unchanged.
The margin of safety as defined in the Technical Specifications is not reduced due to this change since all settings are being made more conservative.77-120 Installed the valves and piping necessary to provide the required intertie between the Unit I and Unit II nitrogen system. This provided the tie-in needed between the two units to allow unit II to become operable.
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The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no new modes of failure are introduced since this change was in the original design.
The margin of safety as defined in the Tech Specs is not reduced due to this change since no safety limits are affected.77-170 In formerly existing circuits the coil relay in the diesel generator overcurrent auxiliary relays was below the minimum target pickup to p value of 0.2 amps for the generator overcurrent relays. Addition of a 75 watt loading resistor provided proper target operation and in no way interfered with or def racted from the circuit function.
The proposed change does not alter, inhibit, or otherwise affect the operation of the protective relaying involved, or any other circuits or equipments. Therefore the possibility ao an accident or malfunction of a differnet type than analyzed in the FSAR does not result from this change.
The margin of safety as defined in the Technical Specifications is not affected, and there fore is not reduced, by this change.77-182 In order to upgrade Hatch 1 refueling bridge grapple to the existing BWR product line the grapple head had to be replaced with one which would house two air cylinders instead of the original one air cylinder. This change provided two gra ppling hooks with an independent air cylinder actuator for each grappling hook. Also a relay was added to the control circuitry thus providing an intentie between the hook position indication switches and the hoist loaded switch such that hoist up power (but not hoist lower) is interrupted if both hooks are not closed.
The Hatch 1 FSAR addresses the occasion and consequences of a fuel handling accident. The standby gas treatment system is designed to handle a fuel handling accident in conjunction with secondary containment. This change does not affect the standby gas treatment system nor secondary containment. Consequently, the possibility of an accident or malfunction of a different type than anlyzed in the FSAR does not result from this change. Nor is the margin of safety reduced.
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77-183 Provided a different feed to one of the supply breakers to switchyard. Former design had both feeds from SUT 2D, causing loss of switchyard service when SUT 2D was de-energized.
The possibility of an accident or a malfunction of a different type than analyzed in the FSAR does not result from this change since the only change is a different power feed and nothing is being added.
The margin of safety as defined in the Technical Specifications is not reduced because this change will provide a more reliable power source for the switchyard service MCC.77-185 To implement latest calculational methods for determining reactor thermal parameters, GEXL process computers softward package was implemented. This included gamma smearing and FPADAS.
The possibility of an accident or malfunction of a different type than that analyzed in the FSAR does not result from this change because the installation of the GEXL software does not include any safety class components nor does it effect any safety related functions.
The margin of safety as defined in the Tech Specs is not reduced due to this change; in fac t the GEXL correllation will increase the margin over the interim calculations that have been implemented prior to this change.77-196 GE HG Recorder B21-R606, Reactor tempe rature, was replaced with a new L & N recorder model 290. This replacenent provided greater reliability and better clarity of printing.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no new modes of failure are introduced.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.77-197 Temporarily installed a reliance motor ID # 447023-RB-1 in place of porter peerless motor ID # L237148. Porter peerless motor burned up but will be replaced when rebuilt.
The probability of an accident was not increased because this was only a temporary change.
The margin of safety was not increased because this was only a temporary change.
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77-230 Four operating BWR's had experienced bent lif t rods in the control valve linkage assembly on the HPCI turbine. Bent lif t rod conditior results in the restricted movement of the rods within the dual bushing assembly in the turbine steam chest cover and prevents full control valve travel. The turbine vendor gedesigned the linkage assembly to reduce 'the bending loads on the lift rods to an acceptable level.
Because of GE's requests, the modified linkage was inctalled on the HPCI turbine to improve its reliability and availability.
There are not any new modes of failure introduced by the proposed change. Possibly, by failure to incorporate the proposed change failure could arise in the control valve linkage assembly on the turbine. Installation is necessary as a preventive measure to help insure against any failure as observed in several operating BWR plants.
Safety limits are not affected as the proposed change would enhance the safety, reliability, and availability of the system.77-236 The drywell spray headers did not operate with the desired differential pressure across the spray nozzles necessary for proper operation. By removing 48 of the center nozzles and replacing them with plugs the total differential pressure increased and now permits proper operation of the drywell spray headers.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change since the designed operation of the spray headers has not been affected by this change.
The margin of safety as defined in Technical Specifications in not reduced due to this change since the nozzle removals improve the operation of the spray headers by increasing the differential pressure across the nozzles. Because of this increase, spray effectiveness is increased, thus increasing the margin of safety as well.77-245 Since the standby gas treatment control switches are located on a vertical panel potential exists with the pistol grip handles to bump them into the off position. An alarm was added to the control switch which now will notify the operator if the control switch is in the OFF position. This alarm eliminates the need for a key-lock switch.
The possibility of an accident or malfunction of a different type than that analyzed in the FSAR does not result from this change because no new mode of failure is introduced.
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The margin of safety as de fined in the Technical Specifications is not reduced due to this change because the SBGT system performs in the same manner as it did before the change.77-246 A manual isolat, ion valve was placed in the RCIC steam supply line drain pot drain line to the main condenser between E51-F026 and the main condensor. This now allows maintenance to repair steam leaks on the steam line without breaker main condensor vacuum. This also minimizes contamination to equipment when a steam leak occurs.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this design change because it does not alter the function of the drain line or prevent it from operating as intended.
The margin of safety as de fined in the Technical Specifications is not reduced at any time by this design change because no safety limits are compromised or even a ffec ted.77-247 A manual isolation valve was placed in the RCIC steam supply line drain pot drain line to the main condenser between E41-F029 and the main condensor. This now allows maintenance to repair steam leaks on the steam line without breaker main condenser vacuum. This also minimizes contamination to equipment when a steam leak occurs.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this design change because it does not alter the function of the drain line or prevent it from operating as intended.
The margin of safety as de fined in the Technical Specifications is not reduced at any time by this design change because no safety limits are compromised or even a ffec ted.77-255 The piping class of line downstream of valve E41-F053, HPCI steam drain system, to the barometric condenser was changed from HBVB to HBD. Unions were installed as required for cleaning this line. Former pipe was clogged and had to be cut to clean. Pipe class HBB re quires a post maintenance hydrotesting while HBD does not. There was no convenient method of isolating the line for a hydrostatic test.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no components are changed. Only the method of inspection is different.
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The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.77-256 Temporarily jumpered alert alarm contacts in parallel to the reactor bldg. vent rad. monitor hi alarm and fail alarm contacts to allow the hi alarm to be annunciated on the control panel Hil-P601.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no new modes of failure are introduced.
The margin of safety as defined in the Technical Specifications is not reduced due to this change because no safety limits or setpoints are affected.77-258 Moved pipe support / seismic restrant R4 & H-3 on plant service water air relief discharge line. Former location interfered with plant service water pump 1A removal.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no new modes of failure are irtroduced.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.77-265 Old pressure control valve G31-F095 was leaking unrepairably with no spare parts. Therefore the valve was replaced with an equivalent, available Casco high pressure regulating valve with same output range. Threaded connection was adapted for slight valve size difference. This was a temporary DCR.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change since no new modes of failure are introduced by the valve substitution.
The margin of safety as defined in the Technical Specification is not reduced since the valve will not affect any safety limits.77-266 Changed accessible portions of the 1" carbon steel vent lines from the diesel storage tanks to stainicss steel. The carbon steel vent line was susceptible to rust. Because of the routing of the line this rust could have caused partial blockage leading to improper venting of the tank.
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The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because component operation .and service are unchanged.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.77-275 Added a protective plexiglass cover to the reactor protection system MG set selector switch that will sheild it from accidental actuation. This clear cover allows visual verfication of switch position and hinged at the top allows rapid access. Accidental actuation of this switch by dangling test leads caused one previous reactor scram.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because the RPS MG set system and its operation is unchanged.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.77-276 Since the GE RHR and HPCI temperature recorder was not reliable enough for the operators requirements the recorder was replaced with a much more advanced Leeds & Northrup Model 250 Series multipoint recorder.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change. System failure modes are not affected. Instrument failure does not affect the RHR or HPCI system and is not different for the new recorder.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.
The recorder is not essential to system operability.77-284 Added loss of DC control battery trip mechanism to emergency 4 KV Bus IF feeder breakers. Since the diesel generator has a limited starting MVA capability, it is essential that on loss of Div. I or Div. II diesel battery the 4KV bus IF can be properly load stripped.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no new modes of failure are introduced.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.
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77-306 Tech specs, Emergency Plan, and HNP-1-7600 require the operator to be alerted when a hi, hi-hi or inop setpoint is exceeded and to distinguish which alarm has been exceeded.
Before adding three separate alarms the former alarms were jumpered together and operator could not tell which was exceeded. Now.. alarms allow operator to make quicker judgements in a situation where time is crucial.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no new modes of failure are introduced.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.77-307 Because the former holes in the R/B instrument sump stand pipes were too large the size of the holes were reduced from 1 1/8" and 1 1/4" to 1/2". This was done by installing threaded nipples in the then existing holes.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because the sump leak detection systen is only being modified to conform with that described in the FSAR.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.
78-3 Fabricated bracket and mounted auto regulator voltage adjust control switch on back of the door. Changed to prevent accidental adjustment of regulator setpoint.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no new modes of failure are introduced.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.
78-9 Replaced formally existing 3-stage Target rock Safety Relief Valve tapworks with 2-stage tapworks. Rerouted air lines and electrical conduit as required to accomodate safety relief valve modifications. Such modifications were done to improve valve reliability and operating characteristics.
The possibility of an accident does not result from this change since the operation of the safety relief valve has not been affected by this change.
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The margin of safety as defined in the Technical Specifications is not reduced due to this change since the replacement of the 3-stage valve tapworks will improve valve reliability and operating charac'teristics as well as increasing the margin of safety.
78-13 Added two cable's to Unit 1 standby gas treatment system logic. Cables run between unit 1 and unit 2. When unit 1 receives LOCA signal, refueling floor high radiation, or reactor bldg. high radiation, unit 2 standby gas system will not start up.
The possibility of an accident does not result from this change because it does not alter the function of the unit 1 SBGT logic or prevent it from operating as intended.
The margin of safety as defined in Tech Specs is not reduced at any time by this design change Lecause no safety limits are compromised or even affected.
78-14 Changed taps on transformers B21-Tl and B21-T2 to obtain output voltage between 20 & 25 volts. Rewired these transformers to provide power to the excess flow check valves indicating lights. Voltage was 27 volts. The bulbs are rated at 24 volts. Change lowered voltage to 23 volts and thus extending bulb life.
The possibility of an accident does not result from this change because no new mode of failure is introduced.
The margin of safety as defined in Tech Specs is not reduced due to this change because safety limits are not affected.
78-32 Pulled cables from the emergency bus undervoltage relay contracts to the RHR panels for compliance with the cross-channel redundant start logic. The original design was deficient in that the redundant start of one channel is lost if the battery for the other channel is de-energized.
This change corrects that deficiency.
The possibility of an accident does not result from this change because the channel separation will be maintained.
No additional failure modes are thus introduced.
The margin of safety as defined in Tech Specs is not reduced because the RHR availability would actually be increased.
78-34 Modified diesel generator muffler piping supports to meet seismic class I qualifications.
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The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this addition of exhaust piping restraints since no new modes of failure are introduced by this change.
The margin o f, safety as defined in the Technical Specifications is not reduced due to this change; the margin of safety is not decreased since the exhaust piping has been upgraded from seismic class II to I.
78-54 TER 76-19 replaced the Robertshan level switch ceramic magnot with an Alnico magnet and removed the temperature compensator spring. It is the purpose of this DCR to make the temporary change permanent. The reliability of the switch is improved.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this adition of exhaust piping restraints since no new modes of failure are introduced. The change does not degrade the switch in any way and can be confirmed due to the fact that the manufacturer now utilizes this type design making the fo"mer design obsolete and actally unavailable fo" use.
The margin of safety as defined in Tech Specs is not reduced due to this change.
78-57 Routed two circuits from the Unit I vital AC system to unit 2 for the purpose of providing power to the Bechtel portion of the " system expansion" system, which will be used for unit II startup. One circuit 'dll be run to equipment in the !!.E. corner of the Unit II control room while the other circuit wil be routed to equipment at the S.E. corner of the unit II reactor bldg.130 ft. elevation The possibility of an accident on malfunction of a different type than analyzed in the FSAR does not result from this change because: The orfginal design intent of the vital AC system as noted in Section 8.7.1 of the FSAR is not changed.
The margin of safety as defined in Tech Specs le not reduced due to this change because: the addition of the two power feeds will not overload the vital AC system and are protected by circai t breakers, identical to existing power feeds from the vital AC system.
78-70 Installed oil catch curbs around base of each RHR service wate" pump because of commitments to IIRC to install curbs to catch oil which might leak from pump thus causing a fire hazard.
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The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this ~
change since no new modes of failure are introduced.
4 The margin of safety as defined in Tech Specs is not reduced due to this change because the likelihood of losing one 'RHR loop by fire is lessened in the event of a pump motor case failure.
78 -71: Installed a 4" gate on the inlet to and on the outlet from EHC oil coolrs to isolate PSW from BHC oil coolers. With this change the EHC coolers can be isolated and therefore changed in a few hours instaed of several days.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from the additional valves since these valves are rated with same temperature and pressure ratings as the original design of the system.
The margin of safety as defined in the Technical Specifications is not reduced due to this change since no safety limits or margins of safety are reduced by this change.
78-82 Standby gas treatment system. Added internal wiring in panels Hll-P654 and Hll-P657 and cables TEE-802-C06 and TEE-701-C06 to start SBGT fans IA and IB on refueling floor hi-radiation.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because SBGT system operation is unaltered except for the additional high radiation start.
The margin of safety as defined in the Technical Specifications is not reduced due to this change because:
safety limits on SBGT starting and filter performance are not affected.
78-92 D/G 1A load sequence timer - rewired to de-energize clutch coil when timer resets. Added contact from 135911 to start LOSP timer upon breaker closure during an LOSP. Added contacts to PSW 1A auto start.
De-energizing the coil when the timer is reset will now allow the use of normally closed contacts.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the timer function is unchanged.
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The margin of safety as defined in the Technical Specifications is not reduced due to this change because: ~
the change allows tne timer to correctly fulfill its- design intent. 3, 78-93 Rewired the reset / clutch oil to de-energize when the timer is reset. Replaced the reset microswitch with a heavier duty microswitch. Also added a normally open "a" MOC contact in series with the LOSP timer motor so the motor will run only when the diesel breaker is closed during an LOSP.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the timer function is unchanged.
The margin of safety as defined in the Technical Specifications is not reduced due to this change because:
the change allows the timer to correctly fulfill its design intent, and the diesel generators are not jepardized due to the longer timer settings.78-121 RWCU penetration changed material of 6" RWCU pipe within penetration to stainless steel. Changed insulation from asbestos to calcium silicate. And changed weld end joint preparation from I level to Vee butt on 14" and 20" lines.
This was all done to improve resistance to stress, corrosion, and cracking.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because: the design change reduces the chance of diesel failure due to uncontrolled breaker closure caused by vibration. No new failure modes are generated.
The margin of safety as defined in Technical Specification is increased by reducing the likelihood of diesel failure.78-137 Provided an annunciator to warn the operator if one of the RHR core spray or plant service water pumps lockouts become actuated.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because: no new equipment is being added by this change; this change used circuits already available.
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The margin of safety as defined in Technical Specification is not reduced due to this change because: the addition of fuse failure monitoring increases s,afety margin by allowing and providing additional monitoring of battery charger status.
NOTE: This is A Unit II and Unit I DCR 78-146 Added an annunciator to warn the operator that the 4160 volt breaker feeding transformer Sll-S009 is tripped and locked.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because no new modes of failure are introduced.
The margin of safety as defined in Technical Specification is not reduced due to this change because no safety limits are affected.78-159 To obtain correct flow indications at remote shutdown panel for RHR and RRR Sw., it was necessary to change the calibrations on 3 remote shutdown system control room instruments . These instruments utilize the same flow elements for delta P input.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because no change in system design, function or hardware is involved, and no new modes of failure are introduced.
The cargin of safety as defined in Technical Snecification is not reduced due to this change because no safety limits are affected.78-166 Drywell to torus diff. pressure system. To allow several isolation valves to isolate properly upon a PCIS trip signal, cables and circuits were reworked and modified.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change since it does not effect the ability of the system to safely isolate should you receive a PCIS trip.
The margin of safety as defined in Technical Specification is not reduced due to this change because the series bypass permissive contact does not provide any safety feature to the torus and D/W differential pressure system.
17 a
78-168 Pipe supports and required insulation were installed on the 1" lines off the 28" recirculation suction lines, to reduce the possibility of failure caused by stress from the weight of the pipe and two valves, l'ength of the pipe, and vibrations from operation.
The possibility'of an accident or malfunction of a different type analyzed in the FSAR doen not result from this change.
There are not any new modes of failure introduced by the addition of support to the test connection lines. Failure to support the lines may result in cracking of the lines as experienced in a foreign DWR.
The margin of safety as defined in the Technical Specification is not reduced due to this change.
Note: This is a Unit II DCR.78-219 NSS shutoff system. Modified main turbine low condense" vacuum switches to result in each of trip Channel A and trip Channel B on each of the two condens er vacuum process lines. Also modified the process piping to add individual calibration taps.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change:
the Group I isolation logic is still of the same intent, separation is not being violated and therfore failure modes for the systen remain unchanged.
The margin of safety as defined in the Technical Specification is not reduced due to this change.78-231 A door was temporarily installed at CRD cavity entrance to seal off the CRD cavity area such that air is forced up between RPV and the sacrificial sheild.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because: this change should lower the average drywell air temperatu re .
The margin of safety as defined in the Technical Specification is not reduced because this change is an attempt to keep the drywell average air tem erature to 135 degrees F or less.78-244 The taps on certain transformers were changed to obtain an output voltage of between 20 to 25 volts. This will extend bulb life for excess flow check valves component. The bulbs are rated at 24 volts, the change resulted in a flow of 22 vol ts .
18 a
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because no new mode of failure is introduced.
The margin of safety as defined in the Technical Specifications is not reduced due to this change, because no safety limits are affected.
Note: This is a Unit II DCR 78-258 Parts of the actuator and regulator in the reactor recirculation sample valve slowly derteriorate in an environment of 150 degrees F. The parts were replaced with parts which can withstand such an environment.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because this change will make valves 2B21-F003 and 2B21-F004 more dependable.
The margin of safety as de fined in the Technical Specifications is not reduced due to this change, because the valve operation will not be changed.
Note: This is a Unit II DCR 78-304 Added a manual isolation in the supply line and one in the return line of the service water lines to the HPCI room coolers so that they can be isolated from the rest of the system.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the change does not change the design intent or alter the mode of operation of the system.
The margin of safety as defined in the Technical Specifications is not reduced due to this change , because this change does not change the design intent or alter the mode of operation of the system.
Note: This is a Unit II DCR 78-307 The high pressure setpoint for drywell Hi/Lo pressure alarm was changed to 0.65 psig from 1.5 psig. This now provides oprators with annunciated warning that the Tech Spec limit on high drywell pressure of 0.75 psig could be exceeded unless corrective action is taken.
19
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because operator action and equipment operation remains unchanged. Corrective action is' initiated at a lower drywell pressure.
The margin of' safety as de fined in the Technical Specifications is not = educed due to this change , because safety limits are not affected.78-315 Heavier piping supports were installed for core spray piping hangars. This change was necessary to prevent piping damage due to possible pool swell problem in case of LOCA.
The possibility of an accident or ralfunction of a different type analyzed in the FSAR does not result from this change because the modification allows for safer conditions due to installation of the heavien, latec model pipe supports.
The margin of ssfety as defined in the Technical Specifications is not reduced due to this change, because sa'ety limits are not affected.
Note: This is a Unit II DCR 78-362 Added weld neck flanges to provide a means of stopping the water flow in the plant service water backwash line so that welding may be performed on the line.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the installation of the flange will not affect any plant service water equipment that 's required during emergency operation of the system, neither will it affect the backwash mode of operation.
The margin of safety as defined in the Technical Specifications is not reduced due to this change, because safety limits are not affected.78-443 Replace relays with Nifon coil bobbins with identical relays with Lexan coil bobbins. This wi'.1 eliminate the poscibility of relay failure due to corrosica caused by halogen release from the nylon in high humidity locations.
The possibility of an accident or malfunction of a differer t type analyzed in the FSAR dces not result from this change because relay operation and system function are unchanged.
Change in relay coil bobbin material cannot create a failure mode that is different.
20
The margin of safety as defined in the Technical Specifications is not reduced due to this change, because relay operation and system function.are unchanged.
2-77-176 Installed a support on the oil reservoir for the RCIC governor control oil system to prevent fatique failure of the control oil line.
The probability of occurrence and the consequences of an accident or malfunction of equipment important to safety are not increased above those analyzed in the FSAR due to this change because: this brace is utilized as support for an oil line which has failed at a previous plant in no way inpairs the ability of this system to carry out its function.
2-77-187 Provided seperation of circuits and down grading of circuit classifications to meet electrical design criteria, section 4.12.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change, since the change is required to meet separation criteria 4.12.
The ma"gtn of safety as defined in the Technical Specifications is not reduced due to this change.
2-77-280 Reconnected the reset circuit within LOSP/LOCA timers in accordance with revised sketch in PDCR 2BE-063 Rev. 1.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change, since the design intent of the timer circuit function is retained unchanged, and no function is cetained unchanged, and no other circuits or equipments are affected.
The margin of safety as defined in the Technical Specifications is not reduced due to this change because safety limits are not affected.
2-78-3 The cable type used on BCX90K through BCX901C22 had a sollid type sheild wire, not braided. Therefore connecting the cables as shown on first suggested attachment one was not possible. This DCR supplied a means for connecting the cables .
21
The probability of occurrence and the consegaences of an accident or malfunction of equipment important to safety ^
are not increased above those analyzed in the FSAR due to this change. The change simply performs the same function as the original design had in mind accept in a different fashion. .,
2-78-9 Installed instrument test vent lines, valves, and caps on the vent side of each scram discharge volume level switch to avoid personnel hazard described in SIL-238.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change, because the change merely gives a safer vent path to be used during surveillance testing of the switches. The existing valve lineups at all other times would be unaffected.
2-78-11 Increased the bore dimensions on LPCI orifices per attached Bechtel Power Co. letter. Former RO's were undersized.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change, because the flow rates achieved will coincide with design.
The margin of safety as defined in Technical Specifications is not reduced due to this change because flow rates are met.
2-78-17 Modified the control circuitry of valves 2 Ell-F021A & B (RHR System) so that the close limit switch is now in series with the close torque switch.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change, because the valve will not self de struct.
The margin of safety as defined in Technical Specifications is not reduced due to this change because the design intent is not changed.
2-78-30 When RHR Sw. discharge PIC's were used in the auto mode the .
RHR sw. pumps went into runout. This occured because the former calibration oniv allowed a max. dp of 100 psid. The normal dP between RHR & RHR Sw. (Shell to Tube) is approx.
200 psid. Therefore the dpT was recalibrated to 0-300 psid.
22
.J
The possibility of an accident or a malfunction of a '
different type than that analyzed in the FSAR does not result from this change, because the design intent remains the same. -
The margin of -safety as defined in Technical Specifications is not reduced due to this change because the design criteria makes the system operate more conservatively.
2-78-34 Elimination of valves 2B31-yl67A and 2B31-F167B (recirculation system) on drawing H-26044 Rev. 6. These valves were not installed in As-Built System.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change, because thses valves do not have any automatic functions associated with safety.
The margin of safety as defined in Technical Specifications is not reduced due to this change because these valves do not affect safety of the oil system.
2-78-44 Changed the tag numbers of condensing chambers on P & ID H26001. Change required to have the P & ID agree with the actual installation of the condensing chambers.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change The margin of safety as defined in Technical Specifications does not change.
2-78-46 Added a set of break flanges between plant service water valves and plant water pumps. With the addition of seismic restraints to the cooling and seal water lines removal of the pumps fonnally could not be done without cutting the minimum flow lines.
The possibility of an accident er a malfunctioti of a different type than that analyzed in the FSAR does not result from this change because system operation remains unchanged and does not effect seismic analysis.
The margin of safety as defined in Technical Specifications is not reduced due to this change because no safety limits are effected.
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2-78-47 Changed the filter metal used on several Rockwell Check Valves from ER316 to ER308L. ER316 fulter metal was not available on site. GPC engineers determined that ER308L is a suitable substitute for ER316.
~
7 The margin of aarety as defined in Technical Specifications is not reduced due to this change because the change does not affect the proper operation of any component in a plant safety system.
2-78-49 In order to incorporate calibration data into the instrument data sheets a value for the flow element differential pressure was included on the instrument data sheet. This value is 1257.25 inches of water at 20,000 gpm.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because the change has no effect on safety.
The margin of safety as defined in Technical Specifications is not reduced due to this change because this value is not covered in tech. specs.
2-78-50 Provided a safety relief valve monitoring system. This now provides a more reliable method to monitor operation of safety relief valves.
The probability of occurrence and the consequences of an accident or malfunction of equipment important to safety are not increased above those analyzed in the FSAR and the possibility of an accident or a malfunction different than those analyzed in the FSAR does not result from this change.
2-78-56 Changed the header hole numbers of three penetrations (neutron monitoring system), per the attached drawings.
While checking one penetration, header hole 5 was found to have an open conductor, requiring the use of a spare header hole.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because no conduit routing is changed for this DCR only header hole numbers in the penetrations are changed.
The margin of safety as defined in Technical Specifications is not reduced due to this change because no change is made which effects the safety margin only header hole numbers within the penetrations are changed.
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2-78-60 Modified new oil drain collection tanks for the diesel genera tors . Tanks now have approx.10 gal capacity and are ^
equipped with sightglasses and drain valves . This will eliminate injector drain overflow. -eg The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because the operation of the diesel is unchanged and no new mode or function of a different type than already exists is introduced by this change.
The margin of safety as defined in Technical Specifications is not reduced due to this change because safety limits are not affected.
2-78-62 Fabricated a bracket and remounted automatic voltage regulator adjust control switch from its former outside location to inside the ca binet . This will prevent accidental change of auto voltage regulator setpoint.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because no new failure modes are introduced.
The margin of safety as defined in Technical Specifications is not reduced due to this change because safety limits are not affected.
2-78-64 Added a set of NC contacts to scheme 2P41-55 & 56. No" mal procedure called for 1 hr run following an auto initiation of the diesels. Upon clearance of the LOCA and/or LOSP signals valve would close preventing 1 he test run.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because materials and procedures used during installation will follow original design criteria.
The margin of safety as defined in Technical Specifications is not . reduced due to this change because this change does not affect Tech Specs.
2-78-70 Added FDI-RWBN Rev. 2 and FDI-RWEZ Rev. O to the P & ID's H26000 and H26001. Also incorporated change in reference for instrument 2CS2-N006 to Ref. 31. (Nuclear Boiler System) 25
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not -
result from this change because it is simply a work change. .
The margin of safety as defined in Technical Specificati$6s is not reduced due to this change because no physical equipment is biing altered only nomendature.
2-78-77 As formerly wired, the group notch control portion of the RSCS logic could not cause an insert block when operating in the A sequence. Therefore modifications were made to now allow the group notch control to cause insert blocks for both A and B sequences.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because this change corrects the system wiring so the system will perform as it is intended to .
The margin of safety as defined in Technical Specifications is not reduced due to this change because this change corrects the system wiring so the system will perform as it is intended to do.
2-78-80 Changed vendor on formally existing local temperature indicators to Ashcroft. Form e" vendor dropped from supplier while Ashcroft instruments were on site as replacements .
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because the original design intent is not changed by changing vendors.
The margin of safety as defined in Technical Specifications is not reduced due to this change because the original design intent is not changed by changing vendors 2-78-81 Installed emergency bus undervoltage relay contacts in the diesel start logic for RHR & core spray system pumps in accordance with PDCR B2E-065 attached.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change since the desi gn intent remains unchanged, and no new or different equipments or modes of operations are introduced.
26
The magin of safety as defined in the Tech Specs is not reduced due to this change since the change is for the -
purpose of meeting FSAR commitments.
2-78-85 An enclosure with Keylock entry was provided for E'he purpose of maintaining controlled access and to prevent against unauthorized operation of the remote shutdown system panels.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this chan ge as no new failure modes are introduced.
The margin of safety as defined in Technical Specifications is not reduced due to this change because safety limits are not affected.
2-78-86 Changed the switch wiring for the RPV level switch system by deleting wire from one contact and replacing with wire from another. Before change level switches as used for "A"
& "B" logic, conflicted.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because it corrects system logic to provide proper operability.
The margin of safety as defined in Technical Specifications is not reduced due to this change because it corrects logic in a system to proper order as intended by initial design.
2-78-87 Added high point vents to the 2G41-2 Ell piping system.
These high point vents will prevent air and water hammers in the RHR piping.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because system operation is unchanged.
The margin of safety as defined in Technical Specifications is not ' reduced due to this change because safety limits are not affected.
2-78-89 A pushbutton reset switch was mounted and wired on the control panel to provide for a manual reset of the breaker closing logic under conditions where loss of either DC control bus 2A or 2B would prevent normal automatic reset of the anti-pump closing logic.
27 m
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not -
result from this change because no new modes of failure or malfunction are introduced that have not been analyzed },in the FSAR. '"
~
The margin of 5afety as defined in Technical Specifications is not reduaed due to this change because safety limits are not affected.
2-78-92 Made modifications to the RPFT portion of the RPS system.
This change will now allow testing of the turbine stop valves.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because the proposed logic change does not alter the original design intent of the RPT system and allows testing of any single turbine stop valve above 30% reactor power without causing a recirc pump trip and the resultant transient induced by an unnecessary trip of both reactor recirc pump at greater than or equal to 30%
reactor power.
The margin of safety as defined in Technical Specifications is not reduced due to this change because the proposed logic change does not alter the original design intent of the RPT system and allows testing of only any one turbine stop valve at a time without unnecess arily tripping the reactor recire pumps.
2-78-93 With former 1/4" tubing, the sample pumps for the offgas monitoring system on panel 2Dll-J013 could not produce a sufficient flow. By increasing the tubing size to 3/8" the greater flow required can be attained.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because the system (flow path, pump size, etc. ) is not being changed, only the tubing size.
The margin of safety as defined in Technical Specifications is not ' reduced due to this change because the 3/8" tubing has the same safety margin that the 1/4" tubing has.
2-78-102 On drawings H27782, H27491, H27831, and H27834 terminal points and wire terminations were changed to correct wiring errors in the logic circuitry for 2B31-P003A and P003B.
28 a
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not -
result f rom this change because no modification to safety logic is being made.
]
The margin of yafety as defined in Technical Specification is not reduced due to this change because it does not modify a circuit covered by Technical Specifications.
2-78-108 Added valve arrangement as shown on attachment to nuclean boiler system at point between valve 2B21-F064A & B and welded cap. This change was added to necessitate hydro of area.
The possibility of an accident or a malfunction of a different type than that analyzed in the FSAR does not result from this change because arrangement is added to comply to conditions of ILRT.
The margin of safety as defined in Technical Specification is not reduced due to this change because valve arrangement added to satisfy margin of safety as analyzed in FSAR.
2-78-109 Installed Unit II refuel floor radiation trip to initiate Unit I standby gas treatment system.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because this DCR implements FSAR requirements.
The margin of safety as defined in Technical Specifications is not reduced due to this change because safety limits are not affected by this change.
2-78-115 Changed the header hole locations of cables (neutron monitoring system) terminating at penetrations 2T52-X100, A, B, D, & E per attachments.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because no change is being made uhich creates the possibility of an accident or malfunction of a different type than those analyzed in the FSAR. All changes being made are being made within each individual penetration.
The margin of safety as defined in Technical Specifications is not reduced due to this change because cable seperation is att11 maintained because these changes are internal within each penetration.
20
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2-78-116 To make relay 2A71-K72 operate, jumper FF7U and FF72 was added to complete the ground loop for system relays.
The possibility of an accident' or malfunction of a different type analyzed in the FSAR does not result from this change because wiring system was done per designers initial intent.
The ma" gin of safety as defined in Technical Specification is not reduced due to this change because system is responding with change as per desi gn intent. Margin of safety is not affected.
2-78-119 Incorporated FDDR HT2-325. This change allows inputs to alarm 4-14 on panel 2Hil-P601 "reacter press, low 500 psig" to again come from 310 psig setpoints.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because original annunciator input was incorrect; this change only corrects annunciator input.
The margin of safety as defined in Technical Specification is not reduced due to this change because the only change involved is the input to annunciator which is for operator reference.
2-78-122 Incorporated FDDR-261 Rev. 2 into control circuitry for the main steam isolation valves 2B21-F022A B, C, D and 2B21-F028 A, B, C, D. Circuitry was not reliable prior to FDDR-261.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because change simplifies existing circuitry making it more dependable.
The margin of safety as defined in Technical Specification is not reduced due to this change because it removes timer and various relays, simplifying circuit. Margin of safety is not reduced without FDDR not sure of circuits performance .
2-78-124 Added backup protection devices to the penetration circuits as required. (Drywell Penetration Feeds System) .
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change as existing protection circuits perform as originally designed.
30
The margin of safety as defined in Technical Specification is not reduced due to this change. '
2-78-126 Provided 4" thick leak sheilding for RBCCW and service water radiation monitors. Background radiation had caused count rates to.,be unacceptably high. Sheilding will reduce backgound count rates by a factor of ten.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the shielding in no way adversely affects the eletronic operation of the mcnitor.
The margin of safety as defined in Technical Specification is not reduced due to this change because the shielding is designed to increase monitor sensitivity to nuclides in the process stream by eliminating interference from backgound radiation 2-78-129 It was required of the NRC that each penetration that is subject to failure from abnormal electrical conditions be protected from that abnormal conditions by primary and backup devices. Therefore such devices were installed.
The probability of occurrence and tne consequences of an accident or malfunction of equipnent important to safety are not increased above those analyzed in the FSAR due to this change. On the contrary, the negative consequences of a malfunction of electrical equipment (eg. a 4 KV circuit breaker) are lessoned because backup protection has been added to existing protection.
? '5-130 Provided air conditioning in the LPCI inverter room because of sensitivity of LPCI inverters to dust.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because any failure of the air conditioning unit would only result in the LPCI inverter room returning to the same condition as presently exists.
The margin of safety as defined in Technical Specification is not reduced due to this change because the addition of the air conditioning unit is increasing the reliability of the LPCI inverters.
2-78-134 Added a vent valve to the vertical run of reactor water cleanup piping to allow for the removal of trapped air in the piping. Such air disrupts normal flow and operation.
31
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not . result from -
this change because provision for venting was previously provided at this locaton (section of piping) and the ' entire section is outside of the isolation boundary. '
The margin of Safety as defined in Technical Specifications is not reduced due to this change because system operations is not affected. Steam leak detection isolation logic is not affected.
2-78-142 Incorporated FDDR HT2-276 to add valve limit switches (RHR system), in interlock for valves 2 Ell-F006 A, B, C, & D 2 Ell-F004B. Interlocks were omitted in original design.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because this change incorporates design which reduces the possibility of draining the reactor to the torus thru the RHR suction valves.
The margin of safety as defined in Technical Specification is not reduced due to this change because safeguards are being added.
2-78-143 Removed fuses from control panels and also removed the fuse holders and attached wiring. These modifications were done to remove the redundant power supply to the DC lube oil pumps for the reactor recirculation system.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the change does not involve a safety function .
The margin of safety as defined in Technical Specification is not reduced due to this change because tech specs do not cover this change.
2-78-145 The original orifice was sized for 1800 GPM and two chiller operations . Only one chiller can operate at any one given time therefore the new orifice was sized for 900 GPM which will allow better distribution of plant service water in the reactor bldg.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the new o-ifice will be made to original design specifications.
32
The margin of safety as defined in Technical Specification
^
is not reduced due to this change because Tech Spec is not aff ected .
2-78-146 Replaced the repeat cycle switch of the LOCA and LbbP timers with a . heavier duty switch and also modified breaker closing circuits for starting plant service water pumps.
The probability of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change, since the design intent of all circuits remain unchanged.
The margin of safety as defined in the Tech Specs is not reduced due to this change because safety limits arc not affected.
2-78-147 Wiring for graphic display lights for 2E11-F040 and 2 Ell-F049 on panel 2Hil-P601 (RHR System) was revers ed .
2E11-F040 was actually the outboand while F049 was the inbound. Therefore the wiring was corrected as such.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because only the gra phic display panel was involved (which is not safety related) .
The margin of safety as defined in the Tech Specs is not reduced due to this change because only indicating lights are being rewired to correctly function.
2-78-150 RHR System. Revised the wiring within local starter to allow the trasfer of control power from the control room to the renote shutdown panel. This now provides more reliable operation of valve 2E11-F008.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because this change ensures that the F008 valve will be able to be operated from the remote shutdown panel of the control room when required to be evacuated.
The margin of safety as defined in the Tech Specs is not reduced due to this change because this change makes the valve operabic from the remote shutdown panel.
2-78-151 Added 3ft. of pipe to dilution air supply input piping, located at the 136' el. of Rx. b1dg. construct. To ensure system works cover is required without obstructing, dilution air flow.
33
- b
The possibility of mi accident or malfunction of a different type analyzed in the FSAR does not result from -
this change because it is being added to ensure proper operation of the system.
The margin of safety as defined in the Tech Specs is not reduced due to'this change because only a hood is being added, it will point towards a major butiding volume to ensure adequate air available for system performance.
2-78-152 Installed the new higher range differential pressure switches. These new switches were required to accommodate the higher RCIC steam isolation signal expected during startup testing.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the ins truments still perform their functions in the design manner.
The margin of safety as defined in the Tech Specs is not reduced due to this change because a tech spec setting is not being modified.
2-78-153 Installed new range differential pressure swi tches . New differential pressure switches were requred to accommodate the HPCI hi steam flow isolation signal setpoint.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the instrunents still perform their functions in the design manner.
The margin of safety as defined in the Tech Specs is not reduced due to this change because a tech spec setting is not being modified.
2-78-154 Made permanent exchange of six Westinghouse type 50 Dhp 250 circuit breakers between units I and II 4160V emergency buses. To faciliate modification program for application of loss-of DC-control trips to Bus IF and 2F breakers.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because no new or different hardware or components are used, and no new modes of failure are introduced.
The margin of safety as defined in the Tech Specs is not reduced due to this change because safety limits are not affected.
34 a
2-78-157 Th ADS permissive logic from RHR did not agree with the description in FSAR. As fonnerly wired on RHR pump running would not satisfy the ADS permissive logic. FDDR 339 was incorporated to solve this problem.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because a non-safety related feature is being modified.
The margin of safety as defined in the Tech Specs is not reduced due to this change because this change does not involve a safety function.
2-78-160 Changed switches for steam isolation valves to Keylock and added annunciator for valves leaving full open position.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the change is conservative in that it prevents an unsafe condition from occurring in these systems.
The margin of safety as defined in the Tech Specs is not reduced due to this change because it involves no tech, specs.
2-78-161 CRD hydraulic system. Installed an additional valve in the pump seal crossover line in the horizontal pipe midway between the two pumps. Therefore both the A & B punps would not have to be valved out to repair the B pump.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because a redundant valve is being installed.
2-78-162 Removed terminal strips from torus electrical penetrations and spliced cables together. The moisture level in the torus was degrading the terminal strips due to buildup of rust.
The possibility of an accident or mal function of a different type analyzed in the FSAR does not resul t from this chan ge . This change only changes the cable terminations in the electrical penetrations from terminal strips to in line splices, increasing the reliability of the cables in these penetrations.
2-78-163 Modified formally existing floor drain configurations on 203' el. of the Rx. Bldg. and modified the drain configuration on line from 2G31-A001 and 2G41-A003. Former arrangement provided a breach in secondary containment.
35
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because: The addition.of trips in the drains piping to ensure secondary containment is in accordance with the original design criteria does not involve an unreviewed sar.ety question.
The margin of safety as defined in the Tech Specs is not reduced due to this change because: The change will improve secondary containnent and the capability of the SGTS to perform its safety function.
2-78-165 Changed purge fan 2T48-C003, blade setting to 15.50 degrees tip angle. (Nitrogen Purge Fan) .
The probability of an accident was not increased because Bechtel system engineer agrees that the fan will perform as before per fan curves.
The margin of safety was not increased bacause fan operates as before.
2-78-166 Cut a rectangplan access hole, approx.16 x 2 1/2 i ns , in the buffer auxilia"y panel of the rod sequence control system so that the printed circuit board is accessible wi.thout completely disassembling the panel.
The probability of occurrence and the cons equences of an accident or malfunction of equipment important to safety are not increased above those analyzed in the FSAR due to this change because this change does not affect the RSCS logical functions. The Desi gn Basis, System Description, Control & Instrumentation and Analysis in Section 7.6.5 of the FSAR remain the s ame. This chan ge reduces the probability of system malfunction because it is more probable the electronic components will perform as intended. The consequences of an accident or malfunction of equipment remain the sane. In the event of mal function of the components, accessibility for maintenance is increased.
2-78-168 The gearing in the valve operator (HPCI & RCIC valves ) had been identified as non-locking. This could have resulted in the valve " pumping" if the torque switch was the only swit ch breaking the circuit. Therefore corrective modifications were performed.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not resul t from this change because the change prevents an accident from occurring.
36
The margin of safety as defined in Technical Specification is not reduced due to this change because it does not -
involve tech. specs. _
2-78-172 Rod and detector display was accumulating dust and dirt by means of air s.ucking effects produced by associated cooling fans thus causing damage. Therefore the air flow was reversed by reverse mounting of the fans. Air filters were also added to suction side of fans.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the controlling circuitry for the fans is not affected.
The margin of safety as defined in Technical Specification is not reduced due to this change because the controlling circuitry for the fans is not affected.
2-78-176 Replace shaf ts on MSIVs 2B21-F022A and F028D with new upgraded shaf ts supplied by Rockwell Internati onal .
Rockwell has upgraded their shaf ts to inhibit galling.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the MSIV stems are metallurically upgraded so as to resist future galling.
The margin of safety as defined in Technical Specification is not reduced due to this change because the shaft is equal to or better than thos e that were originally installed in the valve therefore the margin of safety is not compromised.
2-78-178 Added a "R x . Bldg. Vent Exhaust H i-Hi Radiation" annunciator to the Rx. Bldg. Vent Exhaust Monitor System.
This now provides operators with dual level annunciations for the monitor.
37 a
The possibility of an accident or malfunction of a '
different type analyzed in the FSAR does not resul t from this change because this chanEs increases the reliability of the system.
f3 The margin of -eafety as defined in Technical Specification is not reduced due to this change because this DCR incorporates dual level annunciation into the s ys tem which will allow both " alert" and " alarm" annunciation.
2-78-179 Added an intentie between pumps 2Dll-C001 A & B so that the flow through the pumps will be less restricted. Thus allowing for flexibility in flow switch settings.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the changes made to the system will be made in accordance with existing FSAR requirements for systems installation.
The margin of safety as defined in Technical Specification is not reduced due to this change because the dual annunciation feature orginally present in the system will be retained while adding a pump that will be held in reserve to be used as a backup pump.
2-78-180 Incorporated thermal overloads into MCC Breakers 2R24-S012A, frames 1A, IB, IC, & 1D (MSIV-LCS Heaters)
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because it brings circuit into compliance with designers intent .
The margin of safety as Gsfined in Technical Specification is not reduced due to this change because it brings circuit into compliance with designers intent therefore margin of safety remains the same.
2-78-186 MSIV leakage control system. Corrected drafting error for torque switch labeling on drawing H-27413 Rev. O The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the system will still perform its desired functions when intiated in an emergency situation .
Torque switch protection is being placed in the closed direction only.
The margin of safety as defined in Technical Specification is not reduced due to this change because system will still perform as per designer's intent. The margin of safety is not compromised.
38 J
2-78-191 Several cables in the emergency station service 600 VAC 125/250V station battery system were renumbered. The circuits involved with these cables did not require _ class IE considerations and therefore downgrading from essential to non-essential alleviates seperation problems.
The possibil[ty of an accident or malfunction of a different type analyzed in the FSAR does not result from this change.
The margin of safety as defined in Technical Specification is not reduced due to this change.
2-78-192 Several cables were classified incorrectly according to General Electric Design Specifications. These cables were located in the turbine bldg. leak detection reactor protection system. Bechtel provided the design change to implement the correction.
The probability of occurence and the consequence of an accident or malfunction of equipment important to safety are not increased above those analyzed in the FSAR.
2-78-193 Modified the instrument grounding system. As fonnerly ins talled, the IGS connected to the control bldg.
Grounding system at several panels in the Unit II control room. This condition did not agree with General Eeletric Documents .
The possibility of an accident or malfunction of a different type analyzed in the PSAR does not result from this change because this change does not eleminate the ground system, it changes the ground flow paths so that ground current loops in the plant instrumentation systems are reduced both in number of loops and amplitude of currents.
The margin of safety as defined in Technical Specification is not reduced due to this change because the reduction of electric noise on the instrumentation systems will allow the plant to operate in a normal mode without spurious signals being received by plant instrumentation.
2-78-202 Changed the setpoint for instruments 2T46-N600A & B from
.25" we to 0" we increasing. This will cause the annunciator to alarm if secondary containment is lost instead of when secondary containment is intact.
39
The possibility of an accident or malfunction of a ,
different type analyzed in the FSAR does not result from this change because this change does place the SBGT sys. in conflict with the analysis performed by the FSAR. 0 The margin of -safety as defined in Technical Specification is not reduced due to this change because this change makes the alarm meaningful by alarming an unsafe condition instead of a safe condition.
2-78-204 Changed the piping classifications of drain piping (runs )
between drain hubs to equipment isolation dain- valves from nuclear class MDC to non-nuclear classification MDE to comply with drywell hub classifications.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the change does not involve an unreviewed safety question.
The margin of safety as defined in Technical Specification is not reduced due to this change because Technical Specifications are unaffected by this change.
2-78-208 Changed wire list and wire per the attached wire list.
Also made changes to drawing 791E567RW, Sh 3 Rev. 2. These changes will correct discrepancies in FDDR HT2-186.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because this change affects annunciator circuits only.
The margin of safety as defined in Technical Specification is not reduced due to this change because this change affects annunciator circuits only.
2-78-222 Implemented FDDR HT2-346 Rev.1 to eliminate fuel grapple electrical cable from jamming the main hoist mast.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because the equipnent is intended to increase safety above and beyond that analyzed in the FSAR.
The margin of safety as defined in Technical Specification is not reduced due to this change because it is not covered in the Tech. Specs.
40
2-78-227 Incorporated the telephone and sound powered phone into one cable between the floor plug and the refuel bridge. This -
eliminated excessive static in system.
The possibility of an accident or malfunction o f ' a different type analyzed in the FSAR does not result from this change because the circuit performance is increased, therefore the failure modes are reduced.
The margin of safety as defined in Technical Specification is not reduced due to this change because circuit is updated therefore the margin of safety is not reduced.
2-78-234 Deleted the alarm bells associated with local annunciators on diesel generator local panels. The bells were located in the same room with the fire alarm bells providing a possibly confusing situation. Also when the diesel generator is operating the bells could not be heard anyway.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because no new or different modes of failure are introduced by this change.
The margin of safety as defined in Technical Specification is not reduced due to this change because safety limits are not affected by this change.
2-78-248 Replaced space breaker in Rx. Bldg. with a 10 amp breaker to provide temporary power supply for construction equipment which was terminated directly to the breaker.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result frem this change. The change involves only one cable and one compartment .
The margin of safety as defined in Technical Specification is not reduced due to this change.
2-78-253 Authorized GPE controls LB-240-816 (Limit Switch #1) as a suitable substitute for GPE controls LB-240-1044. Prbnary containment purge system.
The probability of occurrence and the consequences of an accident or malfunction of equipment important to safety are not increased above those analyzed in the FSAR due to this change because the substitute switches, GPE controls LB-240-816, perform the same function as the original switch, LB-240-1042, as outlined in HNP-2 FSAR-6.2.1.2.1.6.1., Page 6.2-4 and 4ft.
41
.8
2-78-254 The CRD hydraulic sytem would not be run in the configuration first described in DCR 2-78-82 until after the refueling outage. Therefore valve positions affected were returned to normal.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change bechuse the valve lineup is being changed back to the configuration that existed prior to DCR 2-78-82.
The margin of safety as defined in Technical Specification is not reduced due to this change because the valve lineup is being prior changed to DCR 2-78-82.back to the configuration that existed 2-78-255 Changed the range on standby gas treatment instrument 2T46-R601 from 0-8000 CFM to 0-5000 CFM thus allowing the instruments accurate connected to the R601 recorder to give a more reading.
The possibility of an accident or malfunction of a different type analyzed in the FSAR this change because the recorder's range does not result from to give the operator a is being lowered system flow. more accurate indication of SBGT The margin of safety as defined in Technical Specification is net reduced due to this change because this change will supply the operator with a more accurate reading thus enabling him to ensure the SBGT flow does CFM. not exceed 4000 2-78-281 Changed the raw water diesel pressure switch setpoint from 30 + 2 psig to 15 psig + 2. Normal operating pressure is approx. 20 psig, the Colt Instruction Manual suggests the switch to be set at 5 psig below nonmal operating pressure.
The probability of occurrence and the consequences of an accident or malfunction of equipment important to safety are not increased above those analyzed in the FSAR due to this change because the change of this setpoint provides a more realistic alarm condition.
2-78-284 Modified the drain line and test vent of RHR Loop "A" level switch to allow for proper calibration operation. during plant The possibility of an accident or malfunction of a different type analyzed in the FSAR doee not result from this change because design intent is unchanged.
42
'e
_.-=
The margin of safety as defined in Technical Specification is not reduced due to this change because design intent is unchan ged. No new components are being added, only existing piping is being re-oriented.
2-78-288 Changed formerly existing solenoid valves for DW-Torus Dp System to ASCO type. Thereby providing an explosion-proof and watertight enclosure.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not result from this change because no new modes of failure are introduced by changing out the existing solenoids to the quick exhaust type.
The margin -of safety as defined in Technical Specification is not reduced due to this change.
2-78-291 Replaced relay 86E on diesel generator logic system with part number 12HEA6R236X2. Reworked wiring as required to faciliate replacement and corrected any improper connections as existed. Relay 86E had burned out with no exact replacements available.
The possibility of an accident or malfunction of a different type analyzed in the FSAR does not exist since all modifications will make the logic perform as designed, the only change being the part number of the relay.
The margin of safety as defined in Technical Specification is not reduced due to this change, as stated above.
2-78-292 Moved fire protectors in the 2A and 2C diesel generator rooms from between the diesel engine air intake and exhaust piping to the other side of the air intake piping, opposite the exhaust piping. This will prevent an inadvertent initiation of the fire protection system due to radiant heat from exhaust piping.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because the equipment is not changed and there is no new equipment added to the system.
The margin of safety as defined in the Tech Specs is not reduced due to this change because the movin g of these instruments will allow them to do a better job of monitoring the area for fire.
43 as
2-78-295 Modified 4KV Bus 2E, 2F, and 2G , circuitry. While performing pre-op test it was found that relays were extremely susce ptible to vibration or shocks cause by breaker operations in the swit'chgear caused unintended relay operati ons. Vendor recommendation indicated that the use of norcally open contacts on these relays would relieve this susceptability.
The probability of occurrence and the consequences of an accident of malfunction of equipment important to safety are not increased above those analyzed in the FSAR due to this change because:
(a) The design intent and circuit functions are unchanged.
(b) No new or different hardware or devices are involved.
(c) Reliability of the systen and control functions is improved.
2-78-296 The MSIV snubber fluid init4. ally installed was Shell-I RUS-902, a water soluble fluid which will seperate if in storage for a long period of time of not being in use.
Therefore this fluid was replaced with a GE silicone SF-1147 fluid.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because the fluid replacement is of similar visocity and properties as the shell IROS, except water solubility, and therefor e would experience similar fialure modes.
The margin of safety as defined in Technical Specification is not reduced due to this change because the replacement fluid performs exactly same functi on as the Shell IROS therefore margin of safety is not compromised.
2-78-299 Changed setpoints for 2T48-PS-N002 to open when pressure in the drywell increases to greater than .77 psig and to reclose on decreasing of less than .65 psig. Now it will function within limits set forth by drawing H-27599.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because this change does not introduce new modes of failure.
The margin of safety as defined in Technical Specification is not reduced due to this change because the new setpoint is more conservative than the current one.
44
2-78-307 Incorporated provisions of FDI-52/12900 as related to resetting hm1 gars HAl, HB1, HA7, and HB7 to the hot s ettings .
The possibility of an accident or malfunction of a different type.than analyzed in the FSAR does not result f rom thi" change. No physical equipment is added the only chmiges being hmager settings.
The margin of safety as defined in Technical Specification is not reduced due to this change.
2-78-318 The safety / relief valves base-to-body flange bolts were re-torqued from 500 ft.-lbs to 710 f t-lbs per FDDR HT2-366.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because the function and actuation setpoints are in no way changed by increasing torque requirement . Failure modes remain the same.
The margin of safety as defined in Technical Specification is not reduced due to this change because the operation of the SRV during an accident situation renains unchanged .
The actuation setpoints are uneffected.
2-78-329 Made modifications to the L & N recorders which were substituted for the Gemac Recorders on FDI-R WEZ. Wiring was changed to reflect vendor specification change. Also installed jumper on recorder chart switch such that chart drive will remain on, in the low speed mode, even when switch is off.
The possibility of an accident or malfunction of a different type than analyzed in the FSAR does not result from this changs because by means of this chan ge , the design function of the POST-LOCA recorders will be fulfilled. The failure modes remain unchanged.
The margin of safety as defined in Technical Specification is not reduced due to this change because this change will permit the POST-LOCA recorders to function as designed.
The design function remains unchanged.
2-78-333 Deleted " IPA", automatic condensate trap, from Table 1 on drawing #H-27744. The item was not physically a part on the refrigeration dryer as on drawing.
45 a
The possibil ity of an accident or malfunction of a different type than analyzed in the FSAR does not result from this change because no new modes of failure are introduced by deleting " IPA" - Automatic Condensate Trap as shown on H-27744.
The margin of safety as defined in Technical Specifications is not reduced due to this change because safety limits are not affected.
2-78-343 Added a snubber in the sensing lines to prevent the jockey pump System, RHR and core spray pump dis charge pressure indicators from being damaged during RHR and/or core spray system operation, due to pressure transients in the system which causes instrument fluctuations.
The probability of occurrence and the consequences of an accident or malfunction of equipment important to safety are not increased above those analyzed in the FSAR due to this change because this change improves the reliability of the asociated instruments as it will dampen out possible damaging pressure fluctuations in the system that the instrument would be subjected to.
46
.a
There were no Test or Experiment Requests not previously reported closed during 1978.
- 4 47
.u
"4 DATA TABULATI0ilS AtlD Ut1IQUE REPORTIf1G REQUIREMEllTS
6 m
r OCCU P ATI0 fl AL PER S0flN EL T. ADI ATIOff EXPOSURE mA
OCCUPATION PERSONNEL RADIATION EXPOSURE This section has been compiled to satisfy the requirements of 'E . I.
Hatch Unit I Technical Specifications Section 6.0.H.1.b (3) and to assure compliance with the Code of Federal Regulations -a s set forth in the pertinent sections of Title 10. Special attention was afforded to the methods prescribed by the Commission in Regulation Guide 1.16 in order that the intent as well as the letter of these laws might be fulfilled while providing meaningful information as to the degree and circumstances of all exposures of personnel at this facility. An indication of the effectiveness of the plant radiation safety program ony be inferred from the large number of personnel with no measureable exposure of minimal dose.
The time period covered by this tabulation extended from 1 January, 1978 through 31 December 1978.
~
All monitored personnel were included in survey as provided under 10 CFR 90.407 (b) (1) (1). Individual exposures as indicated by selfreading pocket ion chambers were recorded daily with the use of a programmable calculator and stored in the associated mass memory disc system. These exposures were tabulated and printed in hard copy on a weekly basis and when required, along with the difference between these readings and the most restrictive exposure limit. The corresponding ion chamber results as recorded on the disc dosimetry files were supplanted by thermo-luminescent dosimeter measurements made over a period of approximatedly one month as the TLD data became available from a vendor.
Each person listed in the dosimetry disc files was assigned a usual job category based on his expected daily activities. There are six job categories of this nature and are identified in the following table. Running totals of dose acquired in each of these categories were maintained for each person in his dosimetry file.
This data is accumulated through two processes:
(1) Each daily dosimeter reading, in addition to being retained for individual exposure record, is added to the total representing the cumulative dose in his usualy job category.
(2) In order to account for exposure in job categories other than the ususal category, the job category dictated by the circumstances of the cov.ered exposure is indicated on each radiation work permit. This data is input via mark-sense cards to the calculator, which subtracts the covered exposure from the usual job category tatal (to which the exposure was added in the daily inputs) and adds this dose to the job category as indicated by the radiation work permit.
The implicit assumption involved in this method of accounting for exposure in different tasks is that all exposure acquired in job categories other than the usual will be documented by a radiation work permit. This circumstance should prevail in all significant cases.
48
OCCUPATION PERSONNEL RADIATION EXPOSURE This section has been compiled to satis fy the requirements of E. I.
Hatch Unit I and II Technical Specifications Section :6.9.1.(b)
^
and 6.9.1.5 respectively and to assure compliance with the Code of Fede ra l Regulations as set forth in the pertinent sections of Title
- 10. Special attenti3n was afforded to the methods prescribed by the Commission in Regulation Guide 1.16 in order that the intent as well as the letter of these laws might be fulfilled while providing meaningful information as to the degree and circumstances of all exposures of personnel at this facility. An indication of the effectiveness of the plant radiation safety program may be inferred from the large number of personnel with no measureable exposure of minimal dose.
The time period covered by this tabulation extended from 1 January, 1978 through 31 December 1978. All monitored personnel were included in survey as provided under 10 CFR 20.407 (b) (1) (1). Individual exposures as indicated by selfreading pocket ion chambers were recorded daily with the use of a programmable calculator and stored in the associated mass memory disc system. These exposures were tabulated and printed in hard copy on a weekly basis and when required, along with the difference between these readings and the most restrictive exposure limit. The corresponding ion chamber results as recorded on the disc dosimetry files were supplanted by thermo-luminescent dosimeter measurements made over a period of approximatedly one month as the TLD data became available from a vendor.
Each person listed in the dosimetry disc files was assigned a usual job category based on his expected daily activities. There are six job categories of this nature and are identified in the following table. Running totals of dose acquired in each of these categories were maintained for each person in his dosimetry file.
This data is accumulated through two processes:
(1) Each daily dosimeter reading, in addition to being retained for individual exposure record, is added to the total representing the cumulative dose in his usualv job category.
(2) In order to account for exposure in job categories other than the ususal category, the job category dictated by the circumstances of the covered exposure is indicated on each radiation work permit. This data is input via mark-sense cards to the calculator, which subtracts the covered exposure from the usual job category tatal (to which the exposure was added in the daily inputs) and adds this dose to the job category as indicated by the radiation work permit.
The implicit assumption involved in this method of accounting for exposure in different tasks is that all exposure acquired in job categories other than the usual will be documented by a radiation work permit. This circumstance should prevail in all significant cases.
49
Further delineation as to the number of persons and amount of exposure of people in different job categories by various personnel categories is indicated by the standard reporting format of Regulatory Guide 1.16. Each personnel dosimetry. disc. ;f,ile contains the personnel category information required to accohplish this compilation. The individual running dose totals for each job were used by the calculator to compute the number of man-rem indicated in each group. Backup disc files were maintained for redundancy in the case of destruction or temporary inaccessability suffered by the main files. Hard copy records as printed by the calculator were also maintained.
By the use of a programmable calculator with disc mass storage, personnel dosimetry information has been compiled, retained and tabulated in such a manner as to satisfy the pertinent Federal Regulations and Plant Technical Specifications. The system has been organized to provide this information in the format specified by these requirements and the suggestions of the Regulatory Guides.
50
1978 PLANT E. I. HATCH ,
STATISTICAL
SUMMARY
RADIATION EXPOSURE REPORT B,
EXPOSURE RANGE (REM)
NO. OF INDIVIDUALS _
N.M.E 723
< 0.1 841 0.1-0.25 218 0.25-0.5 117 0.5-0.75 68 0.75-1.00 21 1 - 2 35 2 - 3 3 3-4 1 .
4-5 0 No exposures greater than 5 R EM This report is submitted in accordance with paragraph (b) (1) 10 CFR 20.407, (1) of 51
-a
I
}
1EIS ELoNI_E _1._BoICU EEEECUUEL_EXEOSUEE_EY_IoSE_&_SY_JCC_1EEE_EECULoICSY_CUICE_1.151 UUdEEE_DE_EEESCSUEL tAlte$'E_DE_Meu:EEd
( > 100 MREM )
SIoIICN UIILIIY CCUIEoCI SIoIION UIILIIY CCUIEoCI ROUTINE SURVEILLANCE & INSPECTION MAINTENANCE & CONSTRUCTION 8 0 0 3 O O OPERATIONS 94 O O 38 O O HEALTH PHYSICS & LAS 32 O O 15 0 0 SUPERVISCRY & CFFICE STAFF 0 0 1 O O O ENGINEERING STAFF 14 0 12 3 0 5 RCUTINE PLANT MAINTENANCE ,
MAINTENANCE & CCNSTRUCTICN 75 1 1 39 0 1 OPERATIONS 45 O O 13 0 0 HEALTH PHYSICS & LAB 2 O O O O O SUPERVISCRY & GFFICE STAFF O O O O O O ENGINEERING STAFF 0 0 1 O O 1 SPECIAL PLANT MAINTENANCE & TESTS MAINTENANCE & CONSTRUCTION 43 1 8 21 0 1 OPERATICNS 18 0 0 5 O O HEALTH PHYSICS & LAB 4 O 1 1 O O SUPERVISCRY & CFFICE STAFF 0 0 1 O O O ENGINEERING STAFF 3 0 154 1 0 27 FUEL CPEPATIONS MAINTENANCE & CONSTRUCTION O O O O O O OPERATIONS 1 O O O O O HEALTH PHYSICS & LAB O O O O O O SUPERVISORY & CFFICE STAFF 0 0 0 0 0 0 ENGINEERING STAFF 0 0 0 0 0 0 RADWASIE OPERATIONS MAINTENANCE & CCNSTRUCTION 2 O O O O O OPERATIONS 13 O O 3 0 0 HEALTH PHYSICS & LAB O O O O O O SUPERVISCHY & CFFICE STAFF 0 0 0 0 0 0 ENGINEERING STAFF 0 0 0 0 0 0 IN-StiRVICE INSPECTION MAINTENANCE & CONSTRUCTION O O O O O O OPERATICNS O O O O O O HEALTH PHYSICS & LAS O O O O O O SUPERVISGRY & CFFICE STAFF 0 0 0 0 0 0 ENGINEERING STAFF 0 0 8 O O 3 TOTALS MAINTENANCE & CONSTRUCTICN 87 3 27 E.4 0 1 OPERATIONS 14E. O O 65 O O HEALTH PHYSICS & LAB 32 0 1 16 0 0 SL'PERVISONY & OFFICE STAFF 0 0 1 O O O ENGINEERING STAFF 16 0 172 4 0 36 52
e R COOLANT CHEMISTRY
SUMMARY
J
REACTOR COOLANT CHEMISTRY Tabulations on a monthly basis of values of SJAE Isotopics and Reactor Coolant system parameters as required by Section., 4.6.F.1 of the Unit I Technical Specifications found in the following tables.
Unit II values are also shown, although it is not required that they be reported.
_uC1L m _ _ - _ .
__.DdIE__ tWI- Z e:133_..St:32 _Ec:33_ _8c:S5m. _h:135_ _Ze:133 .._ec:al. _ _ t!:13_ 31517.1__
1:12:2S_ -_2320 2E5 25.2_. ___31.9_ __31. S__ Fn _ ___352_ 1. 5.__ __9230_ __22L 9__
2:14:23_ __2313_ 1300 225__ ___22 d__ __d22___ _1250___ __22d 0 2200_ .Sa 3120__
3:la 23_ 0 0 O___ O___ ___O --_0 ___0___ 0 O__ _ _0_____
d:26:23_ __2105 125___..163_ 0___ _ _0_ _ __ _2 d 2___ ___0___ 2S23___3300_ __ la1.Z_
Eri-2H_ __20d5__ 72.2_._. 2230_ ____h 21_ _ 2321__ _1.53 O__ __E E3 3C50_. ._llh 2__
5:22:23_ __2003 51.8 _ __0__ 0 0 0 O__ ___0_ 352C_ _ _51. 2___
Z:13-22_ ._2c22. _ _ E L 3__.l 9L _ ___ _0 0 5259___ _ 221__ Q___ __1150_ __SI.55___ ,
3:15:2S_ __22 99___ ^2iE_._ .2 P o O____ _d25e___ _ 153__ O___ __11aQ_ m '" l 2:12-IE_ __2311 3100__ .337 ? E 2__ ___0 933___ __291__ .___0___ __3030_ __5 0 'R ___ l 10:1I:23 __2295__ ___3520__ .512__ __.171__ __221__ _1050___ __S EL_ O___ _ __33h0_ __ E 9 31_.__ l 11:la 22 _2311 3360__ _523 _ ___5/A _2 33___ _1210 _ _ __313__ -___0___ _ _.15 20_.._E 2 5 2___
12:12:22__2312 SEE 2a2 - 103___ __1E2__ __53 9___ __533_ 2.01 =cen so ? -
UNIT I REACTOR CCOLANT CHEMISTPY f
PCv.'ER ICQIEES..luCizo ,1_
l
.__R6IE bWI 1:131_[I:132_ _I:133_..1:133_ 1 135_ Q E._1:131 -
1-17-78 23SO 1.79 4.11 1.32 7.21 3.34 1.C3
_ E:5 E:S__. _E-4 ._E-^ E S __...__E:o -
3-14-78 2318 1.97 4.03 <8.54 8.12 3.28 7.57 i E-G F-4 __E 5__ ._ Erd __ _E-4 __E 5 3-14-78 O 3.19 5.25 1.23 3.80 < 2.39 3.24 E:5___ c-A __E:5__ __E:2__. _E 5_ __ __E 5 4-18-78 '1144 3.42 3.10 5.23 3.30 1.18 3.43 j E:A Fc __E 5__ _ Er d__. ._E:S E:5 5-16-78 0 3.E9 7-29 <1.23 < 3.30 < 2.34 E.51 E-2 E:5__ ._E:5__ ._E:2 E-1 E:2 5-14-78 0 < 5.17 <3.65 <1.23 < 3.3 < 2.34 < 5.30 E:S E S__ __ E:5__.._E 2__ .._E:5__. _ E:S__
7-18-78 2427 8.67 2.71 1.50 1.80 3.06 8.76
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