ML19209B617

Emergency Procedure 1202-36,Revision 6, Loss of Instrument Air.

ML19209B617
Person / Time
Site:	Three Mile Island
Issue date:	09/06/1979
From:	METROPOLITAN EDISON CO.
To:
References
1202-36, NUDOCS 7910100230
Download: ML19209B617 (9)

Text

{{#Wiki_filter:. 1202-36 Revision 6 09/06/79 THREE MILE ISLAND NUCLEAR STATIONPORC CH UNIT #1 EMERGENCY PROCEDURE 1202-36 lVITI; l h I-- - LOSS OF IPSTRUMENT AIR , ,, Table of Effective Pages CONTROL _ED~ COPY Paoe Date Revision Pace Dste Revision Paae Date R evision 1.0 09/06/79 6 26.0 51.0 2.0 09/06/79 6 27.0 52.0 3.0 09/06/79 6 28.0 53.0 4.0 09/06/79 6 29.0 54.0 5.0 09/06/79 6 30.0 55.0 6.0 09/06/79 6 31.0 56.0 7.0 09/06/79 6 32.0 57.0 8.0 09/06/79 6 33.0 # 58.0 9.0 34.0 59.0 10.0 35.0 60.0 11.0 36.0 61.0 12.0 37.0 62.0 13.0 38.0 63.0 14.0 39.0 64.0 15.0 40.0 65.0 16.0 41.0 66.0 17.0 42.0 67.0 18.0 43.0 68.0 19.0 44.0 69.0 20.0 , 45.0 70.0 21.0 46.0 71.0 22.0 47.0 72.0 23.0 48.0 73.0 24.0 as.O 74.0 25.0 50.0 75.0 Unit 1 Staff Recomme pproval Unit 2 Staff Reco me s kpproval-Approval ii Date ' Approvai // , Date Cognizantle'pt. Head Ccgnizant Oe'pt. Hesd Unit 1 RC Recommends Approval Unit 2 PORC Rec mme pprova!

                          $lW & Date Y Y 71             '
                                                                                                  *i C             Date
           ' v/ Chairman of PORC                                                  Chairma'n of PORC Unit 1 Su erintendent Approval                                     Unit 2 Superintendent p         val
             /L&dli                               D.,e    dbv                            hi                        Date y
             -                                            ii Manager Generatior: Quality Assurance Approval                                             /              Date TMe 55 4i. Rev 8/77 v9in,            33o 1107, u      n36 s
                                                      . -.. - -. . . ~ . - ...                    ..         . .

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1202-36 Revision 6 09/06/79 THREE f1ILE ISLAND NUCLEAR STATION UNIT #1 EMERGENCY PROCEDURE 1202-36 LOSS OF INSTRUMENT AIR 36.0 Discussion The Instrument Air System is backed up by service air thru IA-V-1 ' which opens at 70 psi. If pressure continues to decrease to 60 psi, IA-V-26 will isolate the turbine-building and intermediate building headers. Backup instrument air compressors IA-P-2A(B) are l provided to supply air to critical components in the isolated sections necessary for controlled shutdown of the unit. NOTE: This procedure would also apply in the event that piping _ failures rendered the backup systems, described above, inoperable. See Table I, fail position of air operated valves. 36.1 Symotoms

1. Red indicator lights for IA-P-1 A/B and SA-P-1 A/B on PL panel are "0FF".

2. " Instrument Air Pressure Low Turbine Area", " Instrument Air Pressure Lcd Auxiliary Building Area" and " Station Service Air Pressure Low" Annunciator Alarms sound on PL panel Annunciator "B".

3. Low readings at instrument air and service air pressure indicators on PL panel.

36.2 Immediate Action A. Automatic Action

1. IA-V1 (S. A. backup to I. A.) open 0 70 psig.

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1202-36 Revision 6 09/06/79

2. IA-V26 (Turbine, Intermediate, Control and Out Building Supply) closes 0 60 psig.

3. SA-V5 (Fluid block and penetration pressurization backup) opens at 60 psig.

4. .

ckup Instrument Air Compressor IA-P2A starts to supply air to the following valves: l C0 4 5 C0-V51, FW-V7A, FW-V7B, FW-V16A, FW-V17A, CO-V7, CO . ', MA-V3A thru F, i and the following inssruments: LC-8 Hotwell Makeup , i 18E/P Powdex Bypass Viv. E/P FC-7 M.F.P. A Recire. Flow FC-8 M.F.P. B Recire. Flow LC-9 Hotwell High Level Reject , i SP-V2A E/P S.U. FW viv. A E/P i SP-VlA E/P Main FW viv. A E/P SP-V3 A/B E/P B/B C/B Turbine B.P. Vlv. E/P's A/A B/A C/A ICS-36A E/P MFP A Speed Charger E/P ICS-36B E/P MFP B Speed Charger E/P '

                                                                               ;

5. Backup Instrument Air Compress.,r IA-P2B starts'to supply l air to the following valves:

FW-V16R.. FW-V17B, EF-V30 A&B, MS-V6, EF-V8B, MS-V4A&B 2.0 1123 038

1202-36 Revision 6 09/06/79 and the following instruments: PC-5 E.F.P. Steam Pressure l SP-VlB E/P flain R4 Valv. B E/P SP-V2B E/P S.U. FW Viv. B E/P i SP-V4A&B E/P Atmos. Dump Viv. E/P I SP-V5A&B E/P Emerg. FW Vlv. E/P j

6. En.,rgency turbine F.W. pump starts on recirc due to steam inlec valves MSV13A (B) failing open.

7. Cluid block valves OPEN causing injection of water to f1 SCC and ICC water systems.

8. Reactor coolant pump trip (loss of seal injection and intermediate closed cooling water) (within approximately 10 min.).

9. Reactor trips if RC pumps trip.

10. Turbine trips if reactor trips.

11. Loss of penetration cooling (due to damper closure).

12. Loss of industrial cooling to Reactor Builcling (due to RB-V7 closing).

B. Manual Action

• Denotes key parameters that shall be reverified as the first step in follow-up action.

1. Reset thermal overloads and attempt to restart IA-PlA(B) and/or backup compressors.

2. If RC pumps have not tripped, take local manual control of MU-V20 in the open position.

3. Trip reactor when instrument air pressure drops to 60 psig and complete the immediate manual action in the 1

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Reactor Trip Procedure 1202-4. 3.0 ll

1202-36 Revision 6 09/06/79 I

                 *4,       If RC pumps trip, verify emergency feed pumps and EF-V30A           l
                          & B raise steam generator level to 21 feet (50% on the I

operating range). '

                 *5.      Verify that the RCS is subcooled by at least 50UF.

Increase feedwater flow and makeup flow as needed to I obtain 50 UF margin. 36.3 Fol'ow-Vo Action Objective: To provide the steps needed to remove the heat from the RCS by establishing natural circulation cooling and restoring instrument air and its backen air system.

1. Reverify items in manual action 1esignated with an asterisk

(*) using redundant indication where available.

2. When Intemediate Cooling and Seal Injection flow are lost, trip all four reactor coolant pumps.

3. When all four RC pumps are off verify that the emergency feed pumps start and steam generator levels are increasing to 50%.

Establish natural circulation cooling per 1102-16.

4. Verify locally that the backup instrument air compressors are operatingIA-P-2A(B).

5. Add 4814 gal. of 12,250 ppm. boron or equivalent from the Tech Spec Boric Acid Tank. (This corresponds to 906 ft3 of 8700 ppm boron.)

6. If pressurizer level cannot be maintained greater than 100 inches shift suction of makeup pump to BWST.

7. If CO-V8 fails open and condenser hotwell level is high, close C0-V13.

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1202-36 Revision 6 09/06/79

8. If decay heat closed purge tanks indicate high level, verify DC-Vl9A/B failed open due to loss of air and close DC-V20A/B to isolate purge tank makeup. '

9. Conth.ue attempts to restore instrument air, by starting either IA/SA.compresser.-

10. Total loss of plant instrument and service air will require the turbine jacking gear be manually engaged locally,

11. Upon restoration of instrument air, restore NS, IC and seal injection to the RCP's. Restart one RCP per loop and continue plant cooldawn.

12. Restore secondary plant to normal and direct steam flow to the condenser via the turbine bypass valves.

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1202-36 Revision 6 TABLE I 09/06/79 Air Operated Air Fail Valve No. Position MU-V3 Closed MU-V4 Closed MU-V6A Closed MU-V6B Closed MU-V9 Closed MU-V10 Closed MU-VilA Closed MU-VllB Closed MU-V17 Closed MU-V18 Closed MU-V20 Closed MU-V26 Closed MU-V32 Open MU-V51 Closed IC-V3 Closed IC-V4 Closed IC-V5 Fail As Is IC-V6 Closed IC-V74 Open DC-V19A Open DC-Vl9B Open FW-V17A Fail As Is FW-V17B Fail As Is EF-V30A Fail As Is EF-V30B Fail As Is 6.0 ) ) 2 j' )[[ 2

1202-36 Revision 6 TABLE I (Cont'd) 09/06/79 Air Operated Air Fai' Valve No. Position WDG-V24 Closed WDG-V25 Closed WDG-V26 Closed , WDG-V27 Closed WDG-V28 Closed WDG-V29 Closed ~ WDG-V54 Closed WDL-V49 Closed WDL-V50 Closed WDL-V51 Closed WDL-V61 Closed WDL-V89 Closed WDL-V91 Closed WDL-V92 Closed MS-V3A Closed MS-V3B Closed MS-V3C Closed MS-V3D Closed MS-V3E Closed MS-V3F Closed MS-V13A Open MS-V138 Open FW-PlA Minimum Gov. Speed FW-PlB Minimum Gov. Speed 7.0

• p?Z 1.1li l1 s J4J ,

1202-36 Revision 6 09/06/79 TABLE I (Cont'd) Air Operated Air fail Valve No. Position IC-V3 1. Valve can I,e Positioned open IC-V4 under loss of IC-V6 air conditions. MU-V20 2. Valve remains pen f r at MU-V26 least 10 min. 8.0}}