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Extra info for Shutdown, Low-Power Operation at Commercial Nuclear Powerplants
Example text
Kin_ a PWR c(mtainmen[sump wilhdebrisl'nlm i>IJl, team ill'ten hmnd many damaged andA_rincl)rreetly inane w,_rkmay preventeffective recirculaiion oI'react,lr stalled instrument tuhesinside PWR containments. ('(') sump screens a IIWR, Many pers,mnel de,trilled prohlems with mainwererem_wed duringrefueling outagesatm_me mites, and ta_n_np accuratelevelindicattlln in PWRs. N_ione de. at othersthe screenswere coveredwith heltvyphtstic _,c_d_ed thm llrohlem in llWlts. sheeting. In _me plant, _me screenwas removed and the _Ilher was tO-percent uncoveredto allowa recircuhttion IIWR levelsystemstypically used a c_mdensingpot hi capahility.
52 The Appendix R (10 CFR Part 50) fire protection criteria for protecting the sat'c-shutdown capability does not include those systems important to ensuring an adequate level of RHR during non-power modes of operation, (4) For PWRs and BWRs, commitments in final safety analysis reports (FSARs) and license amendments require that specified coolant tempcratures be maintained in the spent-fuel pool and that fuel pool cooling systems be operating to maintain those temperatures. TS require that specificd water levels be maintained in the spent-fuel pool.
L'he following should be provided in the control room: two independent indications of reactor vessel level and temperature, indications of decay heat removal system pcrl'ormancc, and visible and audil)lc indications o1" abnormal conditions. (10)// Develop and implcnlent procedures that cover reduced inventory operati(m for entry into a reduced inventory condition. (11)# Ensure that adequate Ol)crating, operable, or available equipment is prtwidcd for cooling the reactor coolant system. Maintain existing equipment in an ¢)perable or availahle status, including at least one laigh-pressurc system and one other system.