ML20125D552
| ML20125D552 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 12/04/1992 |
| From: | Tietz G COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GCT-92-40, NUDOCS 9212150269 | |
| Download: ML20125D552 (7) | |
Text
..
Commonwealth Edimn ovad Cities Nuclear Power Station 22710 206 Avenue Norm Corcova, lilinois 61242 Telephono 309/054 2241 1
GCT-92-49 l
December 4,1952 U. S. Nuclear Regulatory Commission ATTN:
Document Control Desk Hashington, D.C. 20555 i
SUBJECT:
Quad Cities Nuclaar Station Units 1 and 2 i
Changes, Tests, t; Experiments Completed NRC._Do.cKeLNos J0:25 Land _50-265 Enclosed please find a listing of those feeility :;.d procedure changes, tests, and experiments requiring safety evaluations completed $3 ring the month of November 1992, for Quad-Cities Station Units 1 and 2. DPR-29 and DPR-30.
A summary of the safety evalaations are being reported in compliance with 10CFP50.59 and 10CFR50.71(e).
Respectfully, COHHONHEALTH EDIS0N COMPANY QUAD-CIIIES NUCLEAR POWER STATION
([...od/0 ~s.
Gerald Tietz Technical Superintendent GCT/dak Enclosure cc:
A. B. Davis, Regional Administrator T. Taylor, Senior Resident Inspector i
150043 7'[> 1[k TS 92 9212150269 921204 PDR ADOCK C5000254 R
+
Exempt Change E04-1-92-039 DESCRIPTIDH:
Replace RHRSH flow reversing valve 1-1001-185A due to excessive erosion / corrosion.
SAFETY EVALUATION St#NAk(:
1.
The change described above has been analyzed to determine each accident or anticipated transient described in the UFSAR where any of the following is true:
The change alters the initial tonottions used in the UFSAR analysis.
The changed structure, system or component is explicitly or implicitly assumed to function during er after the accident.
Operation or failure of the changed structure system, or component could lead to the accident.
The accidents which meet these criteria are listed below:
Loss of Coolant Accident UFSAR SECTION 15.6 for each of these accidents, it has been determined that ihr change described above will not increase the probability of an oc'.urrente or the t
consequence of the accident, or malfunction of equipment important to safety as previously evaluated in the UFSAR.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the UFSAR is not created because design of the new valve meets or exceeds the design requirements of the original.
The new valve does not add or remove any tanctions in the RHRSH or RHR subsystems.
This che.nge doesn't remove any-redundancy or diversity from the RHRSH subsystem.
Since the overall design of the RHRSH subsystem is consistent with the original design, this shange does not introduce the possibility of an accident or malfunction di"ferent from those evaluated i
in the UFSAR.
l 3.
The margin of safe &y, is not defined in the bists for any Technical L
Specification, therefore, the safet! margin is not reduced.
l i
-- a m m
SE-92-202 Temporary Alteration 92-1-114 DESCRIPTION:
This tempo m y otterstien installs a recorder to monitor varioJs Main Chimnay SPRING parameters. A six pen recorder will monitor the following parameters:
1.
Incoming 115 VAC to SPING from HCC 27-1, 2.
Photohelic flow gauge low flow annunciator (115 VAC).
3.
Photohelic ',ow gauge nigh flow annunciator (115 VAC).
4.
Regulated i2 VDC from the regulated power supply, BCH-2.
5.
Regulated 5 VDC from the regulated power supply, PSM-2.
6.
External fail circuitry at 10-7 point 12.
This temporary alteration is being put in place under work request QO3845.
SAFETY EVALUATION SUMARY:
1.
The change described above has been analyzed to determine each accident or anticipated transient described in the UFSAR where any of the followli.g !!
true:
The change alters the initial conditions used in the UFSAR analysis.
The changed structure, system or component is explicitly or implicitly assumed to function during or after the accid 6eit.
Operation or failure of the changed structure, system, or component could lead to the accident.
The accitints which meet these criteria are listed below:
Control Rod Drop Accident UFSAR SECTION 15.4.10 for each of these accidents, it has been determined that thr change described above wili not increase the probability of an occurrence or the consequence of the accident, or msifunction of equipment important to safety as previously cvaluated in the UFSAR.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the UFSAR is not created because this temp alt will record various Main Chimney SFING parameters for troubleshooting purposes.
The recorder will test the voltage of incoming power, regulated DC power and external fall contacts.
The installation of th's recorder will not create any new failure modes for the Hain Chimney SPING, HRNG monitor, or any other SSC.
Plant operation will not be affected by this temporary alteration.
The effect this temp alt has on this and other systems will not initiate an accident or transient different from those al *<dy evaluated in the UFSAR.
Equipment failures w 11 not be impacted by ;41s temp alt.
No new equipment failures will be created so as to creata a new accident or transient not previously analyzed in the UFSAR.
3.
The margin of safety, is not defined in the basis for any Technical Specification, therefore, the safety margin is not reduced.
SE-92-203 QOP 3700-2 Temporary DESCRIPTICN:
Add steps to the existing procedure to allow use of the ECCS Trip 3ypass Switches that were installed under modification H04-1(2)-91-019A.
SAFETY EVALUATION SIM4ARY:
1.
The change described above has been analyzed to determine each accident or anticipated transient described in the UFSAR where any of the following is true:
The change alters the initial conditions used in the UFSAR analysis.
The changed structure, system or component is explicitly or implicitly assumed to function during or after the accident.
Operation or failure of the changed structure, system, or component could lead to the accident.
l The accidents which meet these criterla are Itsted below:
LOCA UFSAR SLCTION 15.6 For each of these acctjents, it has been determined that the change described above will not increase the probability of an occurrence or the consequence of the accident, or malfunction of equipment important to safety as previously evaluated in the UFSAR.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the UFSAR is not created because this procedure change will allow operation of the RBCCH pumps with an ECCS initiation signal present.
This will only be allowed if adequate electrical distribution system voltage is available to support starting the RBCCH pumps when all safety related ECCS loads are functioning-during l
a LOCA condition.
This will not increase the possibility of an accident
(
because the procedure only allows re-positioning the bypass switches when an ECCS initiation signal is present and adequate bus voltage exists and therefore the accident already exists.
Since the procedure provides minimum bus voltage values to support starting the RBCCH pumps, it ensures that adequate bus voltage is present to support the operation of the necessary ECCS loads and therefore ensures that voltage levels for these ECCS loads are above the minimum required to support both starting and running conditions.
i L
The failure of the bypass switches, which were defined and evaluated in question #6 will not adversely affect the Unit because indication is L
available to the operators in the event that the switches would fail open.
If the bypass switches were to faii closed the RBCCH pumps could act be re-started with an ECCS initiation signal present.
This has no safety significance because the RPCCH system is non-cafety related and is not required to operate in the UFSAR LOCA accident ;nalysis.
l 3.
The margin of safety, is not defined in the basis for any Technical L
Specification, therefore, the safety margin is not reduced.
l
!-V
4 SE-92-204 QCOS 201-8 Rev 0 DESCRIPTION:
Changed from Q to QC format and enhanced per Writers Guide.
Added prerequisites, precautions, limitations and actions, performance acceptance criteria, procedure steps, attachments, notes and cautions to applicable steps, and steps for IV on steps that lift leads, place jumpers or blocks.
SAFETY EVALUATION SUMARY:
1.
The change described above has been analyzed to determine each accident or anticipated transient described in the UFSAR where any of the following is true:
The change alters the initial conditions used in the UFSAR analysis.
1he changed structure, system or component is expitettly or implicitly assumed to function during or after the accident.
Operation or failure of th9 changed structure, system, or component could leed to the accident.
The accidents which meet these criteria are Itsted below:
Nor,e i
for each of these accidcnts, it has been determined that the change described above will not increase the probability of an occurrence or the consequence of the accident, or malfunction of equipme t important to safety as previously evaluated in the UFSAR.
2.
The possibility for an accident or malfunction of a different type than any previously evaluated in the UFEAR is not created because the following prerequisities added to procedure as listed under PREREQUISITES section; D.3, only requires notification of personnel.
D.4, only requires that Pumps are available or that it has been determined are_not_necessary.
D.10, only requires posting Reactor Vessel Thermocouples at the recorder.
D.11, only verifies that the recorder is operating properly.
012 and D13, only sets up the computer trend with alarm points and display to aid the operator of temperature changes.
D.29, only adds the steps to perform to allow the recirc pumps to be operated above minimum speed but not above 55% which is allowed by procedure.
D.34, only establishes a temperature band.
D.36, only allows the test director to list any valves placed in an off-nornal position and provides tracking of off-normal positions.
D.37, is only a checkoff if pre-test section was performed.
D.39, only insures hoses are installed and secured for venting Recire Pump seals.
D.40, only insures HM has been notified and are prepared to Install Excess flow Check Valves when required.
Therefore they do not create the possibility of a new accident or malfunction.
i 3.
The-margin-of safety, is'not defined in the basis for any Technical Specification,_therefore, the safety margin is not. reduced.
'~
m Hinor Design Change P04-1-91-053 DESCRIPTION:
The Limitorque motor on Residual Heat Removal (RHR) valve H0-1-1001-36A was replaced to standardize MOV component hardware and meet Generic Letter 98-10 requirements.
The current 60 ft.lbf. motor produced a small thrust window.
The new 80 ft. Ibf. notor increases the motor gearing capacity of the valve and results in an increase in the valve thrust window.
SAFETY EVALUATION SlM4ARY:
1.
The change described above has been analyzed to determine each accident or articipated transient described in the UFSAR where any of the following is true:
The change alters the nitial conditions used in the UFSAR analysis.
The changed structure, system or romponent is explicitly or implicitly assumed to function during or after the accident.
Operation or failure of the changed structure, system, or component could lead to the accident.
The accidents which meet these criteria are listed below:
None for each of these accidents, it has been determined that the change descr' bed above will not increase the probability of an occurrence or the consequence of the accident, or malfunction of equipment important to safety as previously evaluated in the UFSAR.
2.
The possibility for.an accident or malfunction of a different type than any previously evaluated in the UFSAR is not created because this change involves the replacement of the Limitorque actuator motor with one that has a higher torque output on a normally interlocked closed containment isolation valve.
The result will be an increase in the thrust window for the velve, which will not affect the stroke time of the valve. -The RHR system is unaffected by this change and no DBAs or Transients are affected.
Yhis change, therefore, does not adversely impact _ systems or functions so as to create the possibility of an accident or malfunction of a different type from those evaluated in the FSAR/UFSAR.
The change in Limitorque motor size was evaluated and found acceptable for overload relay heater sizing, breaker sizing, cable capacity and voltage drop requirements.
3.
The margin of safety, as defined in the be.$: for any Technical Specification, is not reduced because since Primary Containment Isolation and RHR Suppression Pool Cooling modes of operation are not affected by this Minor Plant Change the operation and function of the system and components have not been reduced.
4
Modification M04-1-92-006 D DESCRIPTION:
The changes made by this modification involve upgrading the power feed to the RHR and Core Spray Emergency Air Handling Units.
The existing cables will be abandoned in place ar.d new larger cables will be ir*talled following the routing points of the old cables, where feasible.
These changes are being made to increase the voltage levels at the loads under degraded voltage conditions.
SAFETY EVALUATION StX94ARY:
1.
The change described above has been analyzed to determine each accident or anticipated transient described in the UFSAR where any of the following is true:
The charge alters the initial conditions used in the UFSAR analysis.
The changed structure, s);te..i or component is explicitly or implicitly assumed to functior during or after the accident.
Operation or failure of the changed structure, systen, or component could lead to the accident.
The accidents which meet these criteria are listed below:
LOCA 14.2.4 Fire 10.7 Power bus loss of voltage for each of these accidents, it has been determin;d that the change described above will not increase the probability of an occurrence or the consequence of the accident, or malfunction of equipmer,t important to safety as previously evaluated in the UFSAR.
2.
The possibility for an' accident or malfunction of a different type than any previously evaluated in the UFSAR is not created because as discussed in the responses to questions 5 and 6, the modification has no effect on operating modes or equipment functions.
The installation of_new cable, enhances the reliability of safety equipment powered through the cable, because it improves che voltage at the load under degraded voltage conditions.
Therefore, the modification would not create the possibility of an accident or malfunction of a type different from those evaluated in the-FSAR/UFSAR.
3.
The margin of safety, is not defined in the basis for any Technical Specification, therefore, the safety margin is not reduced.
~
--