ML20058D511
| ML20058D511 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 07/20/1982 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0578, RTR-NUREG-0737, RTR-NUREG-578, RTR-NUREG-737, TASK-2.E.1.2, TASK-TM TAC-48675, NUDOCS 8207270162 | |
| Download: ML20058D511 (20) | |
Text
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Telephone (412) 4564000 Nuclear Division P O. Box 4 Shippingport, PA 150770004 July 20, 1982 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. L Division of Licensing Washington, DC 20555
Reference:
Beaver Valley Power Station, Unit No. I Docket No. 50-334, License No. DPR-66 Auxiliary Feedwater System Safety Evaluation NUREG-0737 Item II.E.L.2 Reference A - Safety Evaluation - Beaver Valley Unit i Auxiliary Feedwater System Automatic Initiation and Flow Indi-cation (TMI Action Plan Item II.E. L.2) Letter Dated 7/2/82.
Gent lemen :
The subject letter identified the following open items stemming f rom the Franklin Research Center (FRC) evaluation of the Beaver Valley AFWS design against the long term safety-grade requirements of NUREG-0578, Section 2.L.7a and 2.L.7b and subsequent staff clarifications with regard to conformance to IEEE Standard 279-L97L.
Item L Inclusion of the testing of AFWS automatic actuation logic in the BVPS Unit L Technical Specifications.
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Response
We understand that your staf f will provide further guidance on the nec-essary revision to the Technical Specifications.
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Item 2 Commit to modifying the ESF status panel such that automatic status illu-i mination will occur when an AFWS Pump is taken out of service.
Response
The staff position is that automa tic indication should be provided in the control room at the system level to indicate a bypass or the deliber-ately induced inoperability of a safety system. Your evaluation further Olbb 1
8207270162 820720
! t PDR ADOCK 05000334 P
Beaver Valley Power Station, Unit No.1 Docket No. 50-334, License No. DPR-66 Auxiliary Feedwater System Safety Evaluation NUREG-0737 Item II.E.1.2 Page 2 stated that the " operational procedures now in effect at Beaver Valley do not minimize the potential for operator errors associated with placing the AFW Pump control switch in the PULL-TO-LOCK position, and that automatic signal inputs from the pump controls (and any other component that could render a train inoperable) will be required to meet NUREG-0700 Guideline 6.5.3. 2 (c) (1)."
in consideration of the following information, we do not agree with the FRC evaluation in this regard.
It is Duquesne Light Company's position that a modification to the status lights and the AFW pump controls will not provide any greater assurance of AFWS operability than is already afforded by existing indications and by the extensive verifications and checks currently being conducted on this system.
The following documented checks enhance the overall AFW System reliability and are performed at the frequencies specified:
Note:
Items 19 or 20 would detect a mispositioned AFW control switch independent of the status panel indication and are performed by various personnel each shift.
1.
Bus amps on the AE and DF Emergency Logged each shift Buses (Motor Driven AFW pump power source) 2.
Oil levels in AFW Pumps / Motors 3.
Turbine Driven AFW Pump Governor Setting 4.
Suction Valve alignment for each pump (valves locked open)*
5.
Discharge Valve alignment from each pump (valves locked in position) 6.
Suction Tank Temperature (WT-TK-10) 7.
Fire Door Checks for AFW Pump Room 8.
Suction Tank Level (2 remote transmitter indications and one local gauge are compared) 9.
Bus Voltage on the AE and DF Emergency Buses (AFW Motor Driven Pump Power Source) 10.
Storage Tank Compartment Heating System Annual check prior to cold weather.
11.
Area Temperature Switch alarm settings
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Auxiliary Feedwater System Safety Evaluation NUREG-0737 Item II.E.1.2 Page 3 12.
Motor Operated Discharge Valves checked Logged each shif t open and power available**
13.
Turbine Driven AFW Pump Steam Supply alignment **
14.
Motor operated discharge valves cycled Monthly and timed. Redundant checks on proper final positioning of valves 15.
Pumps vibration, differential pressure Monthly and flow tested, (2) independent valve alignments verified, continuous communi-cation maintained while discharge valve is closed, bearing temperatures checked, lubrication checked, redundant independent sign off on return to service ***
16.
Pumps flow tested into steam generators, Plant startup after extended valve and control switch alignment outages 17.
Emergency manual suction supply valves Monthly stroked 18.
Automatic start functions and Auto Load Refueling Sequencing 19.
AFW Pump Controls and Motor Operated Logged each shif t Valve switch positions verified **
20.
Control Board walkdown (performed by Con-Performed each shif t trol Room Operator, Nuclear Shif t Foreman, and Nuclear Shift Supervisor)
Manual valves that are locked in position are individually keyed, logged out and maintained in a safe in the shif t supervisors office.
Independent checks by the Shif t Technical Advisor Scheduled monthly AFW Pump tests are staggered such that one shift in any day will not test more than one pump.
Although redundant and independent signatures are required for the valve lists associated with the test, this provides a more diverse means for limiting the consequences of any conceivable opera-tional errors.
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Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Auxiliary Feedwater System Safety Evaluation NUREG-0737 Item II.E.1.2 Page 4 Equivalent information to that afforded by an automatic backlight feature is already provided to the operator by the existing AFW control switch configuration and design features. When a pump is placed in the PULL-TO-LOCK position, the pump status indicating light adjacent to the control switch is extinguished, the switch is rotated 30' counterclockwise and vertically displaced about
.5" from its normal position. The control switch convention maintained throughout the Control Room Benchboard for pumps and breakers, maintains all control switches of this type in a per-pendicular array with respect to the benchboard, horizontal axis, when the pump is operating or in a standby mode, thereby providing the operator a means for checking the status of these components from any location in front of the benchboard sections.
Therefore, two separate means currently exist to provide the operator visual access to AFW pump status indepen-dent of the status board.
The status board is only used as an operating aid and is not exclusively relied upon to convey the status of all safety related systems.
This information is carried over on the shif t log sheets and the AFW pump lockout feature is continuously indicated in the Control Room in accordance with IEEE 279-1971 by two discrete means independent of the ESF status panel.
It should be recognized that the Turbine Driven Feed Pump is a 100%
capacity pump that haa annunciation if its motor operated steam supply valve [MOV-MS-105] is closed.
Two of the Turbine's steam supply valves are locked open, all discharge and suction flowpath valves are either locked in position or annunciated and a PULL-TO-LOCK function is not provided on the steam trip supply valves [TV-MS-105A,B]. Therefore, one 100% subsystem of the AFW System would be available and not subject to the concerns identified in your letter.
The current emergency procedures for post reactor trip conditions require verifications that the AFW pumps are operating and delivering flow to the steam generators. The unique design of the Westinghouse Steam Generators provides a substantial inventory of feedwater in comparison to some other designs and would provide the operators a longer period of time for reacting to multiple malfunctions within the feedwater systems. Beaver Valley is therefore, less susceptible to steam generator " boil out" events.
The proposed modifications to the AFW pump control circuits would not reduce the probability of human error or increase the reliability of this system beyond that which exists with our revised administrative controls, diverse checks and intensive testing program.
Beaver Valley Power Station, Unit No. I Docket No. 50-334, License No. DPR-66 Auxiliary Feedwater System Safety Evaluation NUREG-073 7 Ittm II.E. L.2 Page 5 We have included as Attachment 1, a copy of the current controls established for removing safety related equipment from service during operation for your information. The extensive controls imposed for removing vital equipment from service and its subsequent return to service virtually remove the potential for valving and switching errors in consideration of the diverse checks presently being performed on the AFW System.
Very truly yours, 1'
J.
. Carey Vice President, Nuclear cc:
Mr. W. M. Troskoski, Resident Inspector U. S. Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, PA 15077 L. S. Nuclear Regulatory Commission c/o Document bbnagement Branch Washington, DC 20555 I
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1.48.6 B.
MECHANICAL AND ELECTRICAL CLEARANCE PROCEDURES 1.
The Duquesne Light Company Equipment Clearance Permit (Figure 48-12 N
shall be used as a request form to the N.S.S. on duty for the l
performance of maintenance work. This form shall be initiated by the supervisor in charge of the working group and shall show the date of request, the station, the equipment requasted, the scope of work, the time and date work is to start, the time required, the permit originator, and shall designate the individual in charge of the working party. When the name of the individual in charge of the working party is not known prior to starting the job, proper personnel will be assigned to the clearance permit. The " Equipment Requested" portion shall list all equipment upon which work is to be performed.
The " Scope of Work" portion shall describe in detail the work to be performed on the equipment requested.
NOTE:
If any one of the license personnel that review the equipment clearance or switching order determines that it is for an ESF System or Component then the Emergency Safeguards Equipment clearance checklist must be completed in Modes 1,2,3 & 4 If not required a notation on the Clearance form stating Neither Train Required in the CURRENT OPERATING MODE (Mark CURRENT OPERATING MODE in blank). When in Modes 3 & 6, equipment may be cleared if it is determined that it is not in the priority train.
2.
If the Clearnace Permit is for an ESF component, the Clearance Permit and the Emergency Safeguards Equipment Clearance Checklist shall be O
reviewed by the Shift Technical Advisor to determine if the equipment can be removed from service considering plant operating mode and other equipment status. Recommendation to remove the equipment from service shall be documented by initialling the clearance form on one of the APPROVED BY lines.
3.
If there is no Technical Advisor on shift, the N S.O.F. shall perform this review or if there is nc.NSOF on duty the Reacter Operator shall i
l perform the review.
Exnections to steps 2 & 3 can only be given as l
stated on the Emergency Safeguards Equipment Clearance Checklist.
4.
The Equipment Clearance Permit shall then be delivered to the N.S.S.
l on duty for approval as indicated by his signature on the APPROVED HY l'Ine before actual clearing is permitted.
CAUTION:
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- 1) When isolating any pump, the discharge valve must be seated fully prior to seating the suction valve to prevent overpressure of pump seals and suction lines due to possible backleakage.
While closing the suction valve a second operator must continuously monitor for pressure for pressure buildup (via pump suction or discharge pressure instruments) between the isolation valves until the suction valve is fully closed and depressurization of the pump completed by way of a tagged open drain or vent path within the isolation zone.
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Upon returning a pump to service the pump suction valve must be the first flow path openid to ensure a pressure relief path is ISSUE 1 REVISION 20 l
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1.48.6 B.
MECHANICAL AND ELECTRICAL CLEARANCE PROCEDURES (continued) always available for the pump and low pressure suction piping.
- 2) When utilizing valves provided with reach rods as clearance points, the operators must manually take up on the valve (on the local handwheel operator) when a satisfactory clearance can not be assured by available instrumenttation or monitoring of drain flow between the clearance points.
- 3) On pumps equipped with auxiliary oil pumps (e.g. main feed or charging pumps) the pumps' shaft must be verified to be idle prior to tagging out the oil pump so that forced lubrication will be maintained. The charging pumps' speed increaser can be damaged if reverse rotation occurs since its oil system is seperate from the pumps and is only supplied by a shaft driven pump. Therefore, prior to shutting down a charging pump an operator must visually check to ensure the shaft does not go into a reverse rotation following shutdown unless emergency conditions warrant an unmonitored evolution.
- 4) Factors that must be considered when writing the switching order are:
a.
Potential of water hammer during the fill and vent and system restor-ation sequences to ensure proper component operation after maintenance b.
Overpressurization of pump seals, low pressure suction piping, flanges and spool pieces due to backleakage through a pump.
Availability of makeup water for the fill and vent and sequences O
c.
required for the fill and vent.
d.
Potential of excessive heat up or cooldown rates during the fill.
Potential consequences of alignment changes adversely affecting e.
systems and components outside the clearance boundary.
f.
Preferred anergizationsequence of breakers.
The NCO and NSOF signatures indicate that all control measures (status board mark ups, valve diagram mark ups etc.) have been completed and they are in agreement with the prescribed clearance method in consideration with the above criteria.
5.
A switching Order form (D47-28266) indicating the required operations instructions shall be made out by the Operator to direct each clearance (Figure 48-13).
The signature of the NSOF or NSS authorizing the l
switching or valving shall be entered in the space provided.
It shall be checked and signed by the Reactor Operator or Plant Operator who will l
update the Control Room prints and Status Board.
Switching orders are not a detailed procedure but contain necessary operating instructions to perform standard operations work. The switching order shall prescribe the performance of valve manipulations in order. A switching order shall be made out for all clearance related valving and switching including O
partial clearance " Log Only" system restorations.
The switching order shall contain any precautions to be utilized that may be unique to the required evolutions as determined by the NSOF.
ISSUE 1
_7 REVISION 19 l
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1.48.6 B.
MECHANICAL AND ELECTRICAL CLEARANCE PROCEDURES (Continued) 6.
An Operator prepares the Red Danger Tags (Figure 48-14) for each mechanical t
j and electrical clearance point. Red Danger Stickers (Figure 48-14) should be used on controls mounted on the Control Boards instead of Danger Tags.
If the individual in charge of the working party was unknown at the time of executing the clearance, the red danger tags will be marked in the " Tag on For" space, " Mechanical Maintenance" or " Electrical Maintenance." The preparation of the Red Danger Tags shall contain the following infor=ation in the spaces provided.
STATION: Beaver Valley Power Station DATE: Calendar date danger tag is prepared CLEARANCE PERMIT NO.:
Number of the Duquesne Light Company Clearance Permit SWITCHING ORDER NO.: Number of Duquesne Light Company Switching Order Form (Figure 48-13). If a switching order form is not used, (when posting clearances for D.L.Co.
Construction Department Nuclaar (CDN) construction phase only) this space should be marked N/A for not applicable.
IAG POSTED ON:
Identification of clearance point where tag is to be posted (e.g. valve humber [ valve name if no number is provided]
or "lA Condensate Pump suction valve; number or name of breaker or switch "4KVACB-132" or No. lA Condensate Pump (s) 4KV ACB").
EQUIPMENT CLEARED:
Identification of equipment to be worked upon as indicated in " Equipment Requested" column of the Duquesne Light Company Clearance Permit (e.g. LA Condensate Pump and/or the component number,1f available).
IAG ON FOR: Name of individual in charge of the working party (e.g. John Doe)
If name of the individual is unknown at the time of executing the clearance, the applicable phrase " Mechanical Maintenance" or
" Electrical Maintenance'should be placed in this space on the tag CLEARED OPEN: When a valve is to be cleared OPEN, the words " CLEARED OPEN" must be printed on the bottom of both sides of the tag.
The preparation of the Red Danger Stickers shall contain the following information in the spaces provided:
DATE: Calendar date danger tag is prepared.
CLNCE NO.: Number of the Duquesne Light Company Clearance Permic POSTED:
Identification of clearance point where tag is to be posted EQUIP.:
Identification of equipment to be worked upon as indicated in
" Equipment Requested" cole =n of D.L.Co. Clearance Permit.
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Having secured the necessary authority to do so, the operator in charge ISSUE 1 REVISION 20 l
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1.48.6 B.
MECHANICAL AND ELECTRICAL CLEARANCE PROCEDURES (continued)
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of the apparatus to be worked upon shall remove it f rom service, if operating, before executing the clearance.
8.
An Operator, using the original (or extra, disposable copy in contaminated areas) copy of the Switching Order Instructions as i= mediate reference, performs the clearing operations of closing and opening switches, pulling fuses, assuring the proper installation of grounds, shutting of open valves, opening or shutting drains or vents, or making other essential operations at each point from which the apparatus can be energized, operated, or otherwise made unsafe. A Red Danger Tag previously prepared shall be attached to each of these points of clearance, except as directed under Operating Clearance Provision.
(Figure No. 48-15). When the switching or valving required by the Switching Order Instructions has been completed, the original copy of the instructions shall be destroyed.
When the operator returns to the Control Room, he shall sign the carbon copy of the Switching Orders on the SWITCHING COMPLETED BY line. He also lists on the first two copies of the Clearance Permit the steps taken to clear the equipment both electrically and mechanically and signs the CLEARED AND BLOCKED BY portion of the permit. In addition, he shall list the equipment by mark number, if not previously done, on the Station or Water Treating Equipment Status Board whichever is applicable. Record the date the equipment is removed from se,rvice and place a check on the
" Clearance Established" check column.
9.
The Safety Supervisor and/or the Person in Charge of Working Party shall personally ensure that the clearance points selected have made it i=possible to energize the equipment requested and that red danger tags have been posted properly at those clearance points. The person in charge of working party can request operations support to help track down clearance points.
(,)
10.
The Safety Supervisor and/or the Person in Charge of Working Party shall then sign the Equipment Clearance Permit verifying the " Scope of Work Correct as Described" and the " Checked and Accepted" portions of the permit. The Safety Supervisor and/or the Person in Charge of Working Party will then sign on in red the clearance permit in the clearance permit log book which is maintained in the Control Room.
To expedite work which is to be performed in a radioactive controlled or remote site area, an exception to the above sequence in accepting an Equipment Clearance Permit is described in the following note:
NOTE: When the clearance is on equipment located in a Controlled Area (refer to BVPS Radcon Manual or remote site area *, the person in charge of the working party shall review the Clearance Permit as
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written and prior to going to the work location shall sign the CHECKED AND ACCEPTED portion of the permit and ascertain that the permit has been stamped CONDITIONAL CLEARANCE.
(Figure 48-20).
This person shall also sign the entry in the clearance log and note that the log sheet is stamped CONDITIONAL CLEARANCE.
The person in charge of the working party shall then proceed to the work location taking with him the 1st carbon copy of the Permit.
Before going to the work location in a Controlled Area, the permit will be placed in a clear plastic envelope obtained at the l
l RP Field Office. He shall check the clearance points, the clearance points posted, and then contact the Reactor Operator from the work location. He shall identify himself to the Operator, state the clearance nu=ber under which he is working, and if satisfied l
with the clearance, state his acceptance to the Operator. He will
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post the permit at the work location.
For purposes of the conditional clearance, remote site areas are the Screenhouses, Cocling Tower Pump House, Cooling Tower, Switchyard, I
and Relay House.'
ISSUE 1 9_
REVISION IS l
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1.48.6 m
3.
MECHANICAL AND ELECTRICAL CI.EARANCE PRCCEDLTES (continued)
The Reactor Operator or alternate Operator in the control room will identify himself to the person reporting on the clearance, will recognize the person reporting on the clearance, will acknowledge the clearance permit number, and validate the clearance by recording the acceptance time of the clearance and initialling the conditional clearance stamp on the control room copy of the permit and the conditional clearance stamp in the clearnace log book.
11.
The original and first carbon copy of the permit are removed from the clearance book. The original is given to the person in charge of the working party who posts it on the job in a holder. The first carbon copy is filled at the clearance desk.
- 12. If a vent or drain valve on any radioactive system is to be opened for any reason and lef t unattended, the valves =ust have a clearance tag posted on it as well as on any boundary isolation valves.whose operation could affect the volume of water being drained.
13.
When any clearance on safety-related or radioactive system is signed off " log only", it will be performed utilizing a switching order and will require the valve status boards to be updated such that these prints always reflect the existing status of the system.
The NCO signing the " Checked by" portion of the switchieg order has sole responsibility for updating the prints.
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14.
The RO will be notified anytime a radioactive system venting or draining operation is initiated. The RO and the individual performing the operation will routinely check all available instrumentation until it has been absolutely determined that the boundary isolation valves are holding and they will maintain a close surveillance on the evolution until it has been verified complete.
15.
Prior to restoring any system or subsystem where multiple discipline clearances (construction, plant =aintenance, Type "C" testing, etc.)
have to be lifted, the NSS or NSOF shall be consulted with by the person executing the clearance removal for additional checks or instructions to be perfor=ed during restoration. Ice =s that should be evaluated will include the following:
a.
Possible clearance degradation in adjacent system boundaries due to the fill and vent of the system being restored.
b.
Preferred methods of filling and venting components to prevent l
water haccer and excessive heacup or pressurization rates.
c.
A walkdown of the system during the fill and vent to ensure system integrity.
d.
Review of rotating equipment (remote operated valves and pu=ps) l status to ensure scaffolding or temrorary wiring will not interefere with safe equipment operation.
O)
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e.
Physical examination of pipe supports, snubbers and spring hangers which =ay have been affected by activities in the area.
f.
Rep lace =ent of caps and flanges or temoval of tamporary hese used during the fill and vent;g_
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1248.6 B.
MECHANICAL AND ELECTRICAL CLEARANCE PROCEDURES (continued)
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16.
When the work on the cleared apparatus has been completed the person in charge of the work shall ensure that all tools, test equipment, and personnel are clear of the appartus, that the work area is clear; that safety barriers, ropes or other devices are removed; and that the equipment is otherwise ready for service. The person in charge of the work then returns the posted clearance by signing the permit under " Equipment Ready for Service", and shall also sign and entry in the clearance permit log book relinquishing the clearance. The equipment shall then be returned to service at the con-venience of the operating group. Priority for returning cleared equipment to service must be given to ESF equipment first.
NOTE: When ready to report clear of equipment in a Controlled Area the person in charge of the working party shall remove his posted copy of the clearance permit from the job location and carry it to the HP Field Office where it will be removed from the plastic envelope and retained for General Office accounting. He shall then proceed to the control room where he surrenders the clearance by signing the original copy of the permit under " Equipment Ready for Service",
and shall also sing an entry in clearance permit log book relinquishing the clearance.
17.
The Operators prepare and execute the Switching Order. Apparatus shall not
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not be prepared for service until all persons have signed clear. When this has been done, the Operator shall proceed with the removal of Red Danger Tags, locks and blocking; opening or closing valves; closing disconnects and control switches; and replacing fuses. The Red Danger Tags removed shall agree in p_ i number with those issued, the Operator recording this on the Permit under tO NUMBER OF RED DANGER TAGS RETURNED. All tags except those used in Controlled Areas will be retained with the Permit. Those used in Controlled Areas will be kept with the copy of the permit until the General Office accounting is completed and then the permit and tags will be destroyed and disposed of as contaminated waste. The Operator shall call an Operator in the control room and inform him of the number removed and the Permit number involved. The Operator in the control room shall then note on the Clearance Permit the number of tags removed. When the apparatus has been prepared for operation, the Operator shall sign the Permit under EQUIPMENT ACCEPTED AS READY FOR SERVICE.
In addition, he shall remove the equipment being returned to service from the Station or Water Treating Equipment Status 3orads by erasing all grease pencil markings.
NOTE: For equipment important to nuclear safety, the Station Equipment Status Board shall not be erased until the equipment is declared operable.
18.
When equipment important to nuclear safety is being returned to service, the operator who picked up the clearance and aligned it for service will give the switching order to a second qualified operator. This second operator will verify proper alignment. He will document his independent verification by signing on the line EQUIPMENT ACCEPTED AS READY FOR SERVICE, on the clearance permit under the first operator's signature.
NOTE:
If the plant is in an operational mode where this safety related compon-ent is not required, the redundant, independent verification of align-ment is required.
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1.48.6 Oh 3.
MECHANICAL AND ELECTRICAL CLEARANCE PROCEDURES (continued) 19.
The carbon copy of Switching Procedure (s) and the original and first carbon copy (except for Controlled Areas) of the clearance permits are sent daily to the Station General Office for filing.
20.
System Operator Clearances System Operator Clearances are used when the work area and/or the clearance isolation points extend beyond the jurisdiction of a station and involve more than one operating group. For example, a transmission line may be cleared at one end in a Power Station and at the other end in a Substation, but the actual work may be done by a Transmission and Distribution crew. Three Operating Departments would be involved in effecting safe working conditions and System Operations takes responsibility for communicating with the various Departments and insuring the switching and posting of tags provides the clearances required.
For record purposes and continuity of information past shift changes, the System Operator executes a " System Operator Clearance" for each clearance switched under their direction and a " System Operator Clearance Permit" tied to the switching record by number for each group " reporting on" to do work within the boundaries of the clearance.
Switching: The operator in the station will perform switching as
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directed by System Operators and post red danger tags with the " System Operator Clearance" identification number in the appropriate blank and the words " System Operator" as the person the tag is posted for.
The time that the switching was performed, the indentifying numbers of the tags posted and the name of the System Operator directing the switching will be recorded in the daily Reactor Ooerator's Log and the " System Operator Clearance" number will be carried in the " Active" Clearance Permit Log.
Work Within the Power Station: When work.is to be done within the Power Station, but requires clearance points outside the stations operating jurisdiction (example: inspection and/or repair of line disconnects) a " System operator Clearance" will be executed.
The person in charge of the working party will report on by phone to System Operator who has the responsibility of providing a safe clearance acceptable to the working party.
In addition, an " Area" type clearance shall be executed on an
" Equipment Clearance Permit" form, for Station record purposes except in the " Steps Taken to Clear Electrically" section it shall be noted that " Clearance is provided by System Operator Clearance Permit No.
" inserting the number provided by the directing System Operator.
Logging: The operator doing the switching and posting the red danger tags for the System Operator Clearance will log the eine the switching is completed, the tag nu=bers posted and the na=e of the System Operator requesting the switching in the Reactor Operator Log for that date.
In addition the System Operator Clearance will be carried in the " Active" Clearance Per=it Lo g.
ISSUE 1
~12-REVISION 16
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1.48.6 O
C.
OPERATING CI.EARANCE v
1.
The Equipment Clearance Permit may be issued to cover work that requires apparatus to be operated or energized in order to do the work "I
required. In such cases, the allowable activities and safety =easures taken shall be clearly specified on the permit and shall be carefully checked by the approving supervisor. In addition verbal directions regarding the conditions of operation must be given.
2.
Red Danger Tags shall be posted on the points of clearance, except those points of control which must be used by the person in charge of the working party for equipment operat1on required during the progress of the job. An Operating Clearance Tag (Figure 48-15) shall be posted on these points instead of the standard Red Danger Tags (Figure 48-14) On the controls mounted on the control boards an Operating Clearance Sticker (Figure 48-15) should be used instead of an Operating Clearance Tag. The Operating Clearance Tags shall be used for this purpose only. Operations provided for under the Operating Clearance Tags shall be performed only under the direction of the' person in charge of the working party and do not require this person in charge to sign off in the clearance permit log book.
NOTE: An operating clearance is not to be used where operation of equipment or valves could result in damage to plant equipment installed in operating systems. Operating systems include but are not limited to all reactor plant systems and the turbine-generator plant systems which affect the reactor plant.
3.
Operators or any individuals other than the person in charge of the (n) working party shall treat a posted operating clearance tag in the U
same manner as the normal Red Danger Tag. The posting of the Operating Clearance Tag prohibits the operation of the control station for all purposes except those operations deemed necessary by the person in charge of the working party to complete the job assigreent.
NOTE: Only the person in charge or someone under his direct orders may energi:e the cleared equipment or operate a valve on which an operating clearance tag has been posted.
4 Posting of the Operating Clearance Tags will be noted on the Clearance Pe rmit.
The use of these tags should be provided for by the originator of the permit in the " Scope of Work" section of the Clearance Per=1t.
The posting and the removal of these Operating Clearance Tags will be noted on the Clearance Permit under the " Tags Posted" and " Tags Removed" sections of the per=it by the operator performing these duties.
3.
For operating systems under the cogni:ance of operations personnel, absolutely no operation of equipment or valves is per=itted by other than operations personnel without the use of an operating clearance.
This is in order to =ake operations personnel aware of the status of operating equipment and syste=s at all ti=es and preclude unauthori:ed operation of equipment and valves.
a 1 ISSUE i RE7ISION 13
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EMERGENCY SAFEGUARDS EQUIPMENT CLEARANCE CHECKLIST FIGURE 48-36 MCF-V-1 E
Train A or 3 (Circle One)
O quipment Mark No.
Date Clearance #
Tech. Spec. Ref. No.
READ GUIDELINES ON REVERSE SIDE 1.
This form will be posted beside the ESF panel and utilized to remove all ESF equipment from operation. Steps 1 - 6 must be completed prior to the posting the clearance. Steps 7 - 12 must be completed in sequence. This form will not be removed from this location until all ite=s applicable are signed off as completed.
Determination of operability of the standby equipment is of paramount importance and will include evaluations of all of the following:
A. All Necessary attendant instrumentation is calibrated and functional.
NCO SRO
- 3. The most recent OST of the standby component has been completed satisfactorily and within its surveillance interval.
NCO SRO C. The standby equipment Emergency Diesel Generator is operable and successfully tested within its required surveillance interval.
NCO SRO D. All auxiliary equipment necessary for the component to (s) perform its safety related function (s) are also capable of performing their safety related function (s) (lubri-cation, seal water, cooling water).
NCO SRO E. Standby equipment operability verfied Train A or 3.
NCO SRO 2.
Switching order completed prcperly/S.O. #
NSOF 3.
Itemize all mechanical valves tagged on the clearance. All valves used to vent or drain the component =ust be cleared to that position. Utilize if required.
NCO l
NOTES: 1. The valves are not to be actually cleared until item is signed off.
~
- 2. Independent verification is required upon return to NSA.
VALVE ID NUM3ER POSITION TO 3E CLEARED T0/3Y NSA RETURNED T0/3Y
-/
/
/
/
/
/
/
/
NSA VERIFIED BY
~
O FIGURE NO. 48-36 ISSUE 1 (Page 1 of 4)
REVISION 30 w
B.V.P.S. - 0.M.
O ENERGENCY SAFEGUARDS EQUIPMENT CLEARANCE CHECKI.IST FIGURE 48-36 (continued) 4.
Itemi:e all electrical points tagged on the clearance. All heat trace circuits that are de-energized for the clearance must be checked that they do not degrade the flowpath of the standby subsystem. SEE NOTES TO STEP 3 SWITCH DESCRIPTION POSITION TO BE CLEARED T0/BY
/
/'
- NSA RETURNED T0/BY
/
- NSA VERIFIED BY I
- 0n switches equipped with "AUT0" that are not spring return to the AUTO position (i.e. River Water Pump Discharge Valves) insure the switch is returned to AUTO on the correct header after removal of the clearance.
O
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FIGURE 48-36 ISSUE 1 (Page 2 of 4)
REVISION 30
B.V.P.S. - 0.M.
EMERGENCY SAFEGUARDS EOUIPMENT CLEARANCE CHECKLIST FIGURE 48-36 MCF-V-1 (continued)
N 5.
Clearance Points correct as described.
NSOF 6.
Itemize any caution, lifted leads or 0.0.S. tags as a result of the clearance.
NSOF 7.
A) Authorization for removal from service.
NSOF STA NSS B) Date/ Time removed from service
/
8.
Valves status and ESF mimic prints have been updated.
NCO 9.
ESF status panel updated.*
NCO
- a.
If equipment being cleared is a diesel, or the #1 or #4 UPS Inverter or battery backlight all associated Train status lights.
NCO b.
If a LHSI or EHSI Pump is being cleared backlight both status lights on the associated Train.
NCO If a RW Header is taken out of service backlight the c.
associated Train inside and outside recirc spray pumps.
NCO
[h d.
If the "A" RW Header is being removed from service verify 5"'
water treatment is available for makeup to [WT-TK-10].
NCO 10.
Return to service a.
Verify all tags are accounted for on the clearance.
NCO b.
System filled and vented by.
c.
All items returned to NSA.
d.
Valve status and ESF mimic prints have been updated.
NCO e.
Misc. tags removed (Step 8).
NSOF y..
11.
A.
Operability verification on return to service, all steps NSOD
(
signed off satisfactorily. Attach completed form to the NSS p
clearance.
STA t
B.
Time /Date Returned to service.
/
{
12.
ESF Status Panel updated.
NCO
(
GUIDELINES / PRECAUTIONS l.
Exemptions from use of this form can only be given by the S.O.S. or Os C.E. when current operating mode does require operability of the component.
FIGURE 48-36 ISSUE 1 (Page 3 of 4)
REVISION 30l
+
3.V.P.S. - 0.M.
O GUIDELINES / PRECAUTIONS (continued) 2.
Unattended draining operations are prohibited until it has been verified that the clearance points are holding.
3.
On components being cleared for purposes of PMPs or MSPs whose frequency is longer than monthly and the current operating mode requires operability, approval must be obtained from the S.O.S. or C.E.
4.
Monthly PMPs or MSPs on ESF componen'es will only be performed such that the normal OST scheduled will return the component to service if the current mode requires operability.
5.
Prior to taking a diesel generator out of service switchover all heat trace panels to alarm and control on the operable Train.
6.
All ESF clearances will be given the highest priority on returning the equipment to service.
7.
When any ESF component is 0.0.S. Review each PMP, MSP and OST prior to performing to insure that the minimum equipment operability is not farther degraded by the test.
O I
'J FIGURE 48-36 ISSUE 1 (Page 4 of 4)
REVISION 30
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1.48.10 DUCUESNE UGHT COMPANY SWITCHING PROCEDURE
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STATION DATE TIME M.
i SWITCHING AUTHORIZED BY I
CLEARANCE PERMIT NO.
PREPARED BY T!ME M.
swirc so..o eat..ro.
CHECKED BY TIME M
shirC*i8o A.D Get..f G.
SWITCHING COMPLETED BY TIME M.
sairc so..o c.c.rca REPORTED TO BY ilME M.
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FIGUPI NO. 48-13 Issa 1 i
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