ML20033A473
| ML20033A473 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 11/23/1981 |
| From: | LONG ISLAND LIGHTING CO. |
| To: | |
| Shared Package | |
| ML20033A463 | List: |
| References | |
| TASK-1.C.8, TASK-TM 29.024.01-DRFT, NUDOCS 8111250476 | |
| Download: ML20033A473 (5) | |
Text
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SP Nuxber 29.024.01 (sacti,cn H xd)
Approved:
Revision E
(Plant Manager)
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!$ pt,.3 c; s TPE SIENT WITH FAILURE TO SCRAM f
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E!ERCENCY PROCEDURE
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1.0 SYMPTOMS 1.1 A valid scram signal or condition due to a reactor transient is alarmed' or indicated and all control rods do not fully insert as ?ndicated on the full core display, rod position printout on the computer, or four rod display.
1.2 Reactor pressure and/or neutron flux indication increases abruptly and may-go off-scale on recorders and meters?
1.3 Safety relief valves may lift.
2.0 AUTOMATIC ACTIONS 2.1 1115 psig reactor vessel pressure an'd above actuates various safety relief valves.
2.2 1120 reactor vessel pressure TRIPS the reactor recirculation pumps.
3.0 IleIEDIATE OPERATOR ACTIONS 3.1 Manually scram reactor per SP 29.010 01 (Emergency Shutdown) 3.1.1 Atn and depress manual scram pushbutton.
3.1.2 Place the Mode switch in refuel.
3.3.3 verify all rods are inserted.
3.2 IF the reactor scrams AND Ul rods insert, AND power is dec#ying, -
TilEN do not continue this procedure.
3.3 Trip the recirculation pumps.
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3.4 Commence suppression pool cooling per SP 23.121.01 (Residual Heat Removal (RIUI) System).
3.5 The following attempts to scram the reactor are to be performed concurrently if manpower is available.
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3.5.1 In:crt thono Yoda nte fully incartrd with tha racet:r
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manual centrcl system ac tha Rod Srqusnca Crntrol Sy.; tem (RSCS) permits.
3.5.2 Bypass,the scram discharge volume high level scram switches, reset the RPS trip and verify the vent and drain valves open.
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3.5.2.1 Alternately RESET the Reactor Pro,tective System and SCRAM the reactor until all rods are fully inserted.
3.5.3 Confirm all scram valves are open by observation of scram valve position lights. ]l not, i~ DEN perform the following:
3.5.3.1 DE-EERGIZE RP's subchannel logic by' opening the following breakers on IC71*PNL-991 in the relay room:
a) CB2A b) CB2B c) CB7A d) CB7B 3.5.3.2 Vent air from the scram air system by closing valve C11-02V-0704 and opening vent valve downstream of C11-91V-7104..,,, -p.,,.
3.5.3.3 Restore the breakers and air valves to normal' when all scram valves are open.
3.5.4 Bypass the scram discharge volume (SDV) high level scram suitches, reset the RPS' trip and verify the vent and drain valves open.
3.5.4.1 INDIVIDUALLY SCRAM Control Rods at Local Hydraulic Control Units (HCU's) by placing both NORM-TEST-S.R.I. switches to the TEST position.
3.6 IF reactor power is above 6% Oj[ RPV level cannot be maintained OR suppression pool temperature reaches 110*F, THEN perform the
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following.
3.6.1 Start either A or B standby liquid control pump and inject the entire contents cf the tank.
SP 29.924 91 Rev. E
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3.6.1.1,
))[ RNCU automatic iaolction did n2t eccur,
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. THEN manutlly italsta RWCU.
- 3. 6.1. 2 Terminate all injection into the RPV with the exception of CRD an47RCIC or HPCI to maintain RPV water level above the top of active fuel (IAF).
- 4. 0 SUBSEQUENT OPERATOR ACTION 4.1 Verify immedia'te operator actions.
4.2
))[ reactor pressure is causing t'he safety relief valves (SRV's to cycle, THEN perform the following.
4.2.1 Manually open enough SRV's 'to reduce reactor pressure to between 800 and 960 psig.
- 4. 2. k For subsequent SRV operation, the valves should be c'ycled in order to =inimize local heat loading of the
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suppression pool.
4.2.3.
-If the HPCI system is not in service, it may be placed in full flow test to minimize SRV cycling.
4.3 SAMPLE reactor coolant frequently to verify boron concentration above the level determined to maintain the plant shutdown.
4.4 After the reactor is shutdown, PROCEED to stabilize Plant Condition in Hot Shutdown by performing either steps 4.4.1,.
4.4.2, or 4.4.3.
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CAUTION Do not shutdown SLC Injection once it has been started until the SLC Solution Tank is verified to be empty.
4.4.1 Maintain Reactor ptessure between 800 and 960 psig by use-of Elin Turbine Bypass Valves.
CAUTION Consult with the Nuclear Engineer to confirm that boron concentration in the reactor will be sufficient to maintain the reactor shutdown after accounting for a normal ~startup of the l
Steam Condensing Mode of RER.
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4.4.2
!!aintain ruct:r praccEra betwe n 800 cnd 960 prig by una of tha RHR stscm ccnd;ncing in-ccc:rdcnca with SP
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23.121.01 (Residual Heat Removal (RHR) System).
4.4.3 Maintain reactor pressure between 800 and 960 psig by openihg safety relief valves and utilizing Suppression Pool Cooling to limit Suppression Pool temperature.
4.5 Place the reactor in COLD SHUTDOWN, by performing the following:
4.5.1 Ccnfir:a by sample results and consultations' with the Nuclear Engineer that sufficient negative reactivity has be2n inserted into the reactor to account for the positive reactivity effects of temperature decrease and dilution.
4.5.2 Start the reactor recire pumps at minimum speed.
4,5.3 Shutdown and Cooldown in accordance with SP (Shutdown to Cold Shutdown).
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4.6 Override the RHR pump minimum flow valve to the closed position to prevent the loss of borated water when shutdown cooling is' placed in service.
4.7 Uhen reactor pressure has decreased to 135 psig, Startup RHR Shutdown Cooling in accordance with SP Removal (RHR) System).
23.121.01 (Residual Heat-4.8 If flooding the reactor vessel up to the steam done is necessary use-the SLC aystem.
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4.9 Maiatain boron concentration in the vessel bet. ween 750 and 1000 '
PPM.
- 5. 0 FINAL PLANT CONDITIONS 5.1 The plant is in cold shutdown conditions.
5.2 Reactor level being maintained in the normal o'perating range l
(between 34" and 42" Watch Engineer Review (Watch Engineer) 6.0 DISCUSSION An ATUS is extremely unlikely but will require pronpt operator action to mitigate the consequences. Operator concerns are as follows:
6.1 Verify Recire. pumps trip.
- 6. 2 Shutdown the reactor.
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f 6.3 Limit rczeter pr.ccur$
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6.4 Maintrin tha core covertd.
6.5 Limit Suppression Pool temperature.
6.6 Place plant in Cold Shutdown.
The operator mdst attempt to scram the reactor with.the most readily available means.
If the reactor cannot be gaintained suberitical with Control Rods and reactor level falls. below +12.5" or Suppression Pool temperature can't be maintained below 110*F,
. SBLC c:ust be initiated to minimize containment heat up.
Suppression Pool Cooling should be initiated as soon as possible to ensura suppression pool temperature limits are not exceeded-A Cooldown cust not be initiated until control rods are' inserted or' Boron concentration is satisfactory to prevent a restart of the reactor.
Once' Boron injection is started, it cust be run to completion.
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